What is an Electric Field? (Physics - Electricity)
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- Опубликовано: 25 авг 2024
- This physics lecture will provide you with a clear understanding of what is an electric field.
First, we define the word “Field” and give a few examples of various fields. Once we know clearly what a field is, it becomes easier to refocus on “electric fields”.
And for that, we will create one:
By pinning a charge in space, we realize that the well-known +/+ repulsion and +/- attraction can be described in terms of the effect of an electric field. The video builds from there and the nature of an electric field becomes very clear to the viewer.
If you are not sure what are electric fields, it is very probable you have also trouble with understanding electricity. It is for you that I made this video: Once you get what an electric field is, your study of electrical sciences will appear significantly easier! Understanding what an electric field really is will give you wings in your study of electricity!
The level required to fully enjoy the content of this physics documentary is high school (Grade 9 through 12)
This physics lesson is a part of a 3h online course that discuss electric charges (electrostatics) , electric forces and electric fields and provides many training exercises to crystallize your knowledge and see how it applies in real life. If you found this useful, you will find the course indispensable! And, guess what? It’s available right now!
Course: “Electricty, The Basics”
Link: www.udemy.com/...
This video is produced and presented by Edouard Reny, Ph.D. in materials sciences and private tutor in Physics.
Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to contact him, visit his website: www.physics-tu...
Music composed and produced by Edouard Reny © 2020 (synaptic-machi...)
Especially for enginering students who get lost in maths of phyics, this video is really usefeul to understand fundamental terms. Thanks a lot
Physics is build on some basic principles that everyone can understand. I wish these were a little better taught in high school: I see how my real life students struggle sometimes (I am a physics tutor), and how their view of physics clarifies once I make them understand these basics.
They turn from hating Physics to absolutely loving the subject! This is why I set up this channel, so that all can realize how cool Physics can be when approached the right way :-)
@@PhysicsMadeEasy youre such a beautiful soul and a humble guy ( :
Can we store data in electric field
I always said if you understand something logicaly and intuatively to trully be informed by it, its then that it can look easy and sink in, and you do that briliantly sir, logic and principles must be explained before the math and only then the math wont look wierd and complicated.
Keep it that way
@@tanveerrimsha4520 We already do with computers: RAM. The 1s and 0s are just different values of the electric potential, and electric potentials are caused by electric fields.
During my graduation I was able to solve equations but never could understand the concepts behind them so clearly as I have watching this video, thanks professor.
Thank you Anderson! My video has therefore reached its goal. I am glad it clarified things for you.
I'm in the same boat. I almost feel guilty getting by in physics by solving formulas without really grasping what it all means.
The best explanation on electric field!
You are a wonderful educator and who was also gifted a perfect voice of wisdom and warmness too. Thank you so much for this video and your channel!
You are welcome, I am glad you enjoy my work :-)
All your videos describes your deep understanding for basics .............Thanks.
Thank you for this explanation, no one could visualize this abstract idea like you just did! Helps so much!
Thank you for your kind words, I am glad my video helped!
I am a high-school student from India
I am always curious to learn what is the concept behind
Your videoes always help me
Thank you sir
You are welcome Nirbhaimohith. I am glad my videos help you move forward on your path to learning physics.
I always said if you understand something logicaly and intuatively to trully be informed by it, its then that it can look easy and sink in, and you do that briliantly sir, logic and principles must be explained before the math and only then the math wont look wierd and complicated.
Keep it that way
Thank you סאלח בדר! I agree on that for explaining the basics with students which are not familiar enough with maths to treat it like a language (which concerns many viewers of my channel).
But, when you work on more advanced concepts, then it becomes the other way round: when you do the maths and look carefully at the derivations you come up with, it helps you understand things conceptually much more efficiently than words.
Actually, I train my last year high school students to do just that, so that at university, maths will allow them to understand a lecture, even if the teacher isn't any good. (I caught myself quite often whispering in they ears: "Maths is your friend" lol!)
The animation at first and then the explanation on board helped a lot. This video gave me the idea of the basics of this concept. Thank you🙏🙏
Thank you Shrihari, I am truly glad my work helps in your understanding and that hopefully it gives you what you need to explore further.
I cant explain how awesome this video was. Thank u so much sir.
Sir
Hats off🙏🏻
Simply amazing , im 28 and till now was not really clear about the concept of what really the electric field is
But this video of yours helped me alot
Will surely watch this video 2 3 times more so that i can understand more about e fields
Thankyuuu so much sir ❤
Love from your new Indian subscriber🤗
Thank you for your kind words Ashu. I am glad my work helps you!
Amazing , you explain it in a way that our brain will never forget these informations . Thank you
Wow thank you Edward for these words, it touches me!
So clearly, thank you
This is the best explanation on electric field that you can find ! ❤️
Thank you!
Super underrated. Subscribed.
easy to understand video as always
Sir you are ossum I have been looking for these type of videos for a long time , thanks alot sir
Thank you, I am glad my videos are useful to you!
Great explanation!
Oh, I was blind and now I see! Thank you so much for this wonderful explanation!
Hello Rosa, I didn't know I was an eye doctor ;-). Thank you for this beautiful comment. This is exactly what I try to do as a teacher :-)
Many thanks for your explanation! clearly understandable
You are welcome, I am glad it helped you clarify these fundamental notions.
Thank you sir. You did in 8 minutes what my teacher could not do in 8 lessons.
Hi Luke, I am gad my work is so fruitful!
Teacher talk now ;-): At the light of what you understood with this video, have a look at your class notes / text book and try to redo exercises you remember getting stuck with.
You really helped me a lot sir thanks i hope you still make videos.
Hello Mark, I am glad you found this video helpful. Yes, I am currently working on various video projects. If you are interested in electricity, you should check one of my latest uploads (What is an electric Potential). If you enjoyed 'What is an electric field', you will also like this one.
Thanks for the clear explanation
You are welcome Rob!
It's really helpful, clear ideology abt e field
Best video explanation
Thank you Gabriel! I am glad you enjoyed it.
Thank you so much. It's a very clear explanation.
You're awesome. Thank you very much for such good classes.
Merci Felipe :-)!
I have a doubt (I know I am 3 years late).
On Wikipedia, I read the following definition of electric field:-
"...defined at each point in space as the FORCE PER UNIT CHARGE that would be experienced by a vanishingly small test charge of held stationary at that point".
What does The Force Per Unit Charge mean here? Like what is it refering to, the source or the test charge and what does it mean??
Also the video was awfully nice and comprehensible. Thanks.
The force per unit charge referred in Wikipedia is actually the electric field strength… To answer your question we could reformulate to :
An electric field is defined at each point in space as the FORCE PER UNIT TEST CHARGE that would be experienced by a vanishingly small test charge of held stationary at that point".
An example with numbers : suppose I place a charge Q in space. It generates an electric field in the space around it. Q is thus a SOURCE charge.
I choose a point in that field and I place at that point a charge q = 2 Coulomb. q is thus a TEST charge. I notice that this charge experiences a force F = 10 Newtons. Therefore the strength of the field at that point is E = F / q = 10 / 2 = 5 Newtons per Coulomb (a force of 5 Newtons per unit of charge placed there). Any charge I place at that same point would experience 5 Newtons of force for each of its coulombs...
Does this help ?
Thank you sir. I was so confused before watching this video
I had never seen such a great and easy explanation thankyou sir
Merci Chotu Murmu.
Excellent thanks
Thank you so much
I really needed this for my highschool physics
I am glad my work helped in your studies :-)
Universe is composed of two omnipresent hyperfields: electromagnetic- and gravitational hyperfield, where gravitational consists both gravity and antigravity as each others polarities. These hyperfields are interlocked and interact with each other and materializing on interaction. All matter in the universe is materialized hyperfields and all the more complex forces are created by their interaction through matter. An example of this would be creating electricity through friction: interaction of physical objects disturbs the EM-hyperfield, which creates a local electric charge, materializing into electrons in the center. this is exactly why we see "spontaneous emergenge and disappearance of particles: they materialize from the hyperfields and dematerialize back in to them. Compress the hyperfields into a singularity and you will see a very rapid emergence of particles and forces of nature.
The principle of antigravity engine is to disturb the gravitational hyperfield with two strong vibrating electric magnetic fields, which are created and pressed next to each other, which interferes with the gravitational hyperfield, causing the polarities of gravity collapse into and past each other locally, creating a negative gravitational sphere. The movement is created by creating two antigravity spheres next to each other, which creates a flow in the hyperfield around the antigravity system.
Min :0:40 , field is a region in space for which each point is associated with a quantity ,
If this region is everywhere in the space ,this is not a field any more. But a whole space ,an invisible sphere.
See space like a stage on which you place a film of various colors, a color field (each point with a spatial coordinate would be associated with a visible wavelength). The stage is the stage (space), and the colored film is the colored film (field).
Still, you can also see the stage as a field in itself if you consider gravitational fields (here it is a property of the point in space itself that would have a quantity, the curvature associated with it)
SO GOOD THANK YOU
I like your videos, you explain things well. Thanks!
Thank you Anna, I am glad you enjoyed my way of explaining things :-).
Excellent
Sir you are great....explain the things in very different way
Thank you Jabbar
So nice after +2 i understood
Fine lecture you did sir 👍🙂
You said "electric field is a region of space...".. You are defining this field in terms of space, space has nothing to do with the production of this field. If the field source leaves, the space/region won't stay "charged"
Rather define electric field in terms of the object that produced it. Electric field is not a region of space just as wind is not a region of space. Electric field is a product or function that was produced by a charged object. Describe electric field in terms of the charged object not the space you detected its force function or presence.
You haven’t finished the sentence Brigitte: electric field is a region of space… where a charge will experience a force.
If you remove the source of the field, than that region of space loses that property…
Your comment refers just to a question of semantics.
If you prefer, one could say, an electric field (Strength) is a function that depends on position and that expresses that a charge would experience a force of electric origin at that position.
You could also say that an E Field is a layer that covers space (like a sheet of plastic on paper) and provides it a certain property (force on a charge placed there) like the plastic provides shininess to the paper.
But again, imho, for me all these approached are equivalent in absolute… We do not know for sure what space is or what it’s made of, so the distinction in definitions is not really necessary at this point. Maybe in the future, it will become relevant.
Even further in this train of thought: some say that space and particles only exist via their properties, i.e their interactions… So in the end, fields (or the mathematical functions representing them ) would be the only things that truely exist, and space just an emerging object.
@@PhysicsMadeEasy ok thanks for your reply...
Can you define an electric field not in terms of space/region , not in terms of another charged object experiencing a force in that field?
@@brigittelars5564 Not really...Imagine an universe with only one single charge. It would create a field around it . But if no other charge existed, then this field would not have any effect. So would it really exist? ;-)
@@PhysicsMadeEasy yes it will exist regardless of no charge to detect it. The felled tree made a sound in the forest even if there was no ear there to hear it. The electric field is a property of the charge not the property of space. This is my argument. Popular lectures and textbook always describe a field in terms of a region of space or its effect on another charge instead of describing electric field as an intrinsic property of the charge that produced it. Can we have some maths describing a field as a property of charge instead of a region and effect on another charge?
@@brigittelars5564
Hi Brigitte, and happy new year,
Your analogy kinds of disserves your argument. For the sound wave to propagate following the tree falling, you need air… Take out the air, you have no sound, even if you have ears present around… Space is the medium where the electrical influence of a charge can propagate. Remove space, you have no field… So the field generated by a charge is intrinsically associated with the space around that charge. Thus, it cannot be a intrinseque property of a charge, because you need an external object (Space) for the field to exist 😊
On the other hand, I am not totally deaf to your argument about which perspective to take to define a field. Text books neither.
A field seen as a region of space where a charge experiences a force is expressed mathematically by E = F/Q. But you can also take the perspective of the charge : E = kQ/d^2....
THANK YOU!
and then theres me understanding and not understanding veritasiums video so i came here and learn everything from the beginning
Wow! that is a compliment! Veritasium videos are amazing (the recent one on complex numbers blew my mind!). The fact that you see my channel as a complementary reference where you can get the knowledge to fully enjoy his videos fills me with price. Thanks!
im actually so slowed but this cleared it up for me thanks professor 🙏
Hi, thanks for your feedback. I am glad my work helped you.
Thank you so much!! I am fascinated by physics but it seems so intimidating. Your video helped it not be
hey bro samee
Just great! I am starting binge watching of your videos :)
Binge watching my videos :-)! Thanks, I am glad you enjoy my work (and physics!)
Very good explanation sir. I request to put some more common and analogue examples to explain electric field
Thank you for your kind words and suggestions. You know explaining such concept in 5 minutes doesn't leave too much place for many examples. However, there are some application cases in the course I produced along with this video: Electricity, The Basics (www.udemy.com/course/electricity-the-basics/?referralCode=640E55D087C7FDBE5110).
thank you so much
Thanks a bunch professor! It was really helpful! ❤
You are much welcome Namikaze. Thank you for your kind comment.
thank you dr Reny, your vids are very helpful; can you please tell me if there is a region of space that if you place an electric charge there, it will not feel a force?
Yes, such position would be where the net electric field strength is zero: Imagine two charges of same sign and magnitude. Place a third charge at equidistance between them, this charge will feel a net force of zero Newton...
Another case: The electric force between two charges is inversely proportional to the square of the distance between them, so if you position the charges so far away from each other that the distance between them can be considered as infinite, then, these will not experience an electric force either.
Thank you so much Sir, You are Amazing 😊
Thank you Aman!
Nicely explained the concept of electric field. if I consider only a field line from a given electric field (only One Vector) and this vector has displacement for example 1 centimeter long and there could obviously be many points on this one centimeter long vector. Is the intensity of the electric field is same on each point on the underlying vector or we just consider the average of the intensity of a vector?? An object having more net charge (protons or electrons) will have stronger electric field around it? Do neutrons play any role in developing an electric field? What type of acceleration is there when a charge experiences a force ? The repulsive force of little positive q charge is actually the repulsive force exerted by the big positive Q?
OBS: Do you have lectures on: My requirement is that I need lectures on the basic formulas of physics and how these formulas had been constructed and the logics behind the formulation of the formulas. For example: F=ma. why mass is multiplying with acceleration and why there is a need to remove the proportionality sign in order to have an equation and similarly there are many other formulas such as the formula of calculating the coulomb. My curiosity is to deep dive into exploring the logics behind the construction of the physics formulas and it will help me in developing the mathematical modelling (equations, functions etc.) for a different phenomenas of physics and ultimately I can Embed them into intelligent electronic circuits.
Hi Jony. asnwers to your questions:
"if I consider only a field line from a given electric field (only One Vector) and this vector has displacement for example 1 centimeter long and there could obviously be many points on this one centimeter long vector. Is the intensity of the electric field is same on each point on the underlying vector or we just consider the average of the intensity of a vector?? "
Imagine you draw a vector that starts at point A and ends at point B. The vector represents the quantity at point A, not at point B or any other points along the arrow…
"An object having more net charge (protons or electrons) will have stronger electric field around it?"
Yes
"Do neutrons play any role in developing an electric field?"
No, by definition neutrons are neutral… Although it is not entirely true in absolute because a neutron is made of quarks which are charged. Therefore , a neutron does have an electric dipole moment. But if you consider a neutron like a point particule, no, it doesn’t generate a field around it.
"What type of acceleration is there when a charge experiences a force ? "
F=qE =ma, so a = qE/m
"The repulsive force of little positive q charge is actually the repulsive force exerted by the big positive Q? "
Yes, in magnitude, but opposite in direction : third law of Newton
"OBS: Do you have lectures on: My requirement is that I need lectures on the basic formulas of physics and how these formulas had been constructed and the logics behind the formulation of the formulas. For example: F=ma. why mass is multiplying with acceleration and why there is a need to remove the proportionality sign in order to have an equation and similarly there are many other formulas such as the formula of calculating the coulomb. My curiosity is to deep dive into exploring the logics behind the construction of the physics formulas and it will help me in developing the mathematical modelling (equations, functions etc.) for a different phenomenas of physics and ultimately I can Embed them into intelligent electronic circuits."
You can gain that logic by truly understanding the underlying physical phenomena. The mathematical formulas that model these phenomena are just a a simpler way to express what’s going on compared to words which can require long sentences.
To cite your example, F=ma can be derived from the definition of inertial mass (= resistance to acceleration)
I hope it helps !
Very good 🙏🙏🙏🙏🙏🙏. Thanks
Thanks sir
Thank u sir
Im from india im so excited to see ur video
Thank you Sweta, I am glad you enjoyed it
Thanks
Nice explanation
i am from INDIA but found your video much helpful and useful
Thank you! I'm glad my videos help you 😊
It was helpful thankyou man 👍
You are welcome. I am glad you found my work useful.
@@PhysicsMadeEasy that day there was exam after 12hrs and you know it helped me a lot . Don't know you know it or not but marks are very sensitive in our india thanks 👍. You gifted me 4marks in it
Thanks a lot sir!
Thank you ,sir.
Your amazing !!!
Thank you Zaid!
Are we sure that EM fields are managed by nature differently than gravity? Gravity feels like it's a field, but it's actually not - it simply informs the nature of spacetime itself. Are we sure something similar isn't going on with an electrical field, and why?
Good question: You just placed your finger in what grips Physics as we understand it, the conflict between general relativity (classical physics) and quantum physics. After the 30s, Einstein has been trying to answer that question all his life by unifying the two theories... with no success.
Gravity seems to be the consequence of a curvature of spacetime, not a force per say, while the other forces seem to emerge from the exchange of virtual particles. If you try to set gravity as a force based on exchange particles (gravitons), you end up with inconsistencies, that only untested theories like string theory or quantum loop gravity can solve.
And considering electrodynamics in the same paradigm as general relativity, I do not know what work has been done on that matter (but I think this is related to Aether theories, where there would be a kind of space that acts as medium for the electric force...).
Thankyou professor 🙇♀️
Great explanation, thank you 🙂
Merci Line!
Respected sir,
If the charge big Q is not present. Does that mean there's no electric field ? Or the electric field is just 0 at all points? Basically, does the Electric field exist in empty space having magnitude 0 at all points
Hi Yoga,
Interesting question, that is more at the borderline of Philosophy of science. So you will not find a straight forward answer to this one, but 2 propositions to think about.
My 2 cents: It depends about how you consider the relationship between space and electric fields.
a/ If you consider an electric field like a property of space, then yes, it still exists with a value of zero, like a gravitational field in the sense of Einstein’s relativity: If the gravitational field strength is zero, that means that the curvature of space is zero. The curvature of space still exists, it is just of value zero.
b/ If you consider an electric field like an abstract entity that is on the stage that is space, then it would be reasonable to say that it there is no electric field, like if you removed the tablecloth that covers a table, then there is no tablecloth.
Let me know what you think.
Thank you sir for your reply and yes, as you said, i find it easy to think about the relationship about space and e field the general relativity way of describing space..
I have another question sir, just curious to know how Prof. Maxwell or Prof. Michael Faraday would have thought about electric field. Like, when they developed these ideas in electromagnetism, how did they think about electric field and its relationship with space.. 😅
@@yogahariharan4532 thank you hariharan for these questions,, i hope you will get an answer from him
Sir, Great video. Is it correct to assume that there is electric field in a metal wire connected to a battery?
Absolutely correct BlackBox. Connect the 2 terminals of a battery with a wire (short circuit). A uniform electric field establishes in the wire for which the lines follow the shape of the wire. The charges in the circuit feel that force (F=qE), and start moving: a current establishes in the circuit.
@@PhysicsMadeEasy Sir, Thanks a lot. It has cleared lot of confusion.
thanku so much sir . its amazing
You are welcome Ronanki. I am glad you enjoyed my work.
Great video, its hard for me to find information in my native language and even tho English is my second language the video is so well explained that anyone can understand, do you have optic videos? i'll take optics in 1 week and i don't know anything, that's why I'm studying electric fields and gauss laws for now to understand Maxwell equations
It is good to know what an electric field is, but if you are starting optics from scratch, you probably will not be confronted to that notion yet... So do not worry!
You will learn about reflection and refraction (For example in a lense), and how to calculate / draw the direction of light rays. Once you understood the rules to apply practically, and if you want to know why light behaves that way, check this video: ruclips.net/video/wiPHp-V30lc/видео.html.
(wait until you know how these rules work before watching the video. The video explains the why not the how).
Good luck with your studies!
I am currently struggling to comprehend the mechanics behind its operation. While we are capable of measuring fields, our primary goal is to grasp the fundamental principles underlying the distortion of spacetime that gives rise to this phenomenon. Does it involve contraction or stretching of space, the emission of microwaves, or the generation of fields by electrons through the warping of space?
Hi Celio,
I think you are trying to unite electromagnetism and gravitation here (Task nobody ever achieved)!
The immediate action at a distance of Newton’s theory of gravitation bothered many scientist including Einstein. When Maxwell described EM with field theory (where cause and consequence are limited by the speed of light), Einstein might have got inspired by this to try and generate a field theory for gravity. It didn’t really work, but his genius twist was to realize that spacetime itself was mimicking what a gravitational field would look like.
So to answer your question : Gravity results from the bending of spacetime. But Electric Fields do not.
Please note that what is presented in this video, is limited to a view of physics.
Amazing Explanation, even though I am seeing for the Spiritual purpose.
You know, the spiritual vision of a field is not that far from the physical one... Both are regions of space where every point have a specific property that defines the field.
For example, a Human Spirituality field (Aura): Every point of a region surrounding a human being could be associated with a value. The sign of that value could be defining negativity and positivity, and the number, the magnitude of that negativity of positivity. :-)
@@PhysicsMadeEasy What a beautiful and wise explanation, thanks.
I like this channel
Me too :-)
How does this property put into the field, i mean just a particle have to be in the field to transfer it's property!
You mean, for this property to be active?
Take a ball. Its color is blue. The property 'color', has a value: 'Blue'. Now place the ball in a dark room, with no light. Is the ball still blue?
Yes, it is, although 'not active'. The 'color' property is that when exposed to white light, the ball appears blue.
Same for charges (it is active in an electric field, inactive without an electric field, but still exists).
Sir pdms oil is triboelectric that mean it produce static electric soo this oil is repell iron needle
Subscribed❤️❤️
Where's the energy coming from
What exactly is the property the space inhabits when there is a charge
What is happening to space
Hi, if you place a charge in empty isolated space, there is no extra energy. But if you bring a second one, you need to work on that charge to do so. Now there is an energy in that space.
This energy will attempt to dissipate (understand equalize itself in all points of space). In other words entropy of that space will attempt to increase (2nd law of thermodynamics).
electric field means field of -ve charges?
An electric field is a region of space where a charge would experience a force. Both negative and positive charges attract / repel both negative and positive charges... The source of the field can be a positive or a negative charge, and the charge the field acts upon, also can be negative or positive.
In other words, the sign only affects the directions of the forces involved, not the fact these forces exist forces.
@@PhysicsMadeEasy clear. Thanks.
Is the field strength really a property of that point in the field, or is it a property of the charge? I guess you say that it is a property of the point because there could be other charges nearby altering the field?
Hello Simon, The electric field strength only depends on the charge that creates the field, not the charge that is affected by it. So yes the charge creating the field provides a new character to all the points in space that surround it. The electric field strength is a property of a point.
@@PhysicsMadeEasy Thanks for that clarification. So the field is not really a thing on its own, it's just a measurement or a set of measurements of all the combined effects of surrounding charges.
why we need that concept?? what is the utility of the electric field idea??
Fields are a crucial concept in Physics that is used to build theoretical models. It allows to have a global view on a phenomena without having to focus on all the specific interactions. And finally, it drastically simplifies calculations. And in a very pragmatic perspective, fields allow to create maps !
Actually, the idea of fields works so well both in classical and quantum mechanics, that many scientist tend to believe that reality is defined by fields... meaning that fields do exist, and that everything we experience emerges from them (for example, particles do not exist, but quantum fields do).
Such debate is still very much open!
What is the “region of space” made of?.
In other words, you are asking what is space.
If I knew and could prove it for sure, the wall of my office would be covered with Nobel prizes haha!
There are multiple routes that you could explore:
First, learn about quantum field theory from which the standard model of particle physics comes from. The problem is that the latter has trouble describing gravity (and combining with general relativity). So we need a deeper theory.
Two main candidates: String Theory, and Quantum Loop Gravity (or possibly a combination of both, some explore the fact that these two theories could actually be the same, but developed with a different approach).
Can we store data in electric field
We actually already do! The ram in your computer in your computer works like this (1 and 0 correspond to different voltages).
Excellent explanation. Thank you very much! I have already visited your web site and subscribed as well. Can you please create a lecture on photon if you have not covered it already... ?
In the above illustration you used a e metal bar with a free electron to explain the electromagnetic radiation.
What about a burring charcoal ? It emits light too which is also a electro magnetic radiation. Can you explain this phenomenon please...
Hello Ravi,
Thank you for subscribing to the website. Although, I will lose the list very soon, because I just changed website host (they were too expensive, and I couldn’t afford them anymore… ). If you go on the website, it has changed: I rewrote it completely from scratch these past 2 weeks. I made it with the same design but many aspects of it are cooler now :-).
As for your question: the radiation you are referring to is black body radiation, and it is generated by the same principle: in a material, heat relates to the oscillation of its particles. An oscillating object is basically an object accelerating. These particles are charged (Electrons for example), thus, the electromagnetic field they generate fluctuates, which in other words means that light is emitted.
@@PhysicsMadeEasySIR, how do we know electrons are oscillating
@@atripathi7063 because light is emitted ;-). More precisely temperature is a measure of the kinetic energy of the particles in a body. So the particles in a body move when you heat up that body. When these particles are charged, they electric fields will move too, creating electromagnetic waves... The macroscopic result is white light (light containing all colors)
The yellow map was France, right?
Yes, (I am French)
Thanks for another excellent video. What causes electric field and how it produces non contact force?
The force in the electric field is triggered by the charge that ventures inside it...
@@PhysicsMadeEasy I think microscopic charged particles produce electric flux which produces electric field. Flux represents density of microscopic charged particles in a region of space while field represents strength of force field can produce. It is analogous to gas in a baloon. Increasing the quantity of gas in the baloon produces outward(repulsive) force and decreasing the quantity of gas in the baloon produces inward(attractive) force. Like charges increase the density of charged particles in the space b/w charges which results in repulsive force. Opposite charges reduce density of microscopic charged particles which produces attractive force. Force produces motion.
@@zakirhussain-js9ku Hi Zakir, Interesting comment.
I do not introduce the concept of electric flux in my videos, (maybe one day I will), because these are made for high schools students. I prefer to see electric flux just by the number of field lines passing through an area. If a volume has no net charges inside it , the net flux through the surface of that volume is zero. If there is a charge in that volume, then the net flux is not zero (meaning that volume excretes a net electric field).
I really like your analogy with the balloon. In that analogy, you could consider the added or removed gaz, like a non zero charge inside the volume, where extra gaz = positive charge, deficit in gaz = negative charge. The force experienced by a unit of quantity of gas outside the volume would be the electric field strength.
Be careful with your wording though: “ Like charges increase the density of charged particles in the space b/w charges which results in repulsive force.”
You probably mean something like this "like a non-zero charge in a volume will exert an ’electric‘ outward pressure (Flux density) on charges of the same sign located on the surface of that volume and outside of that volume."
@@PhysicsMadeEasySir, thank you for reply;
I think you are interpreting my comments in terms of Maxwell equations which elegantly explain static and dynamic behaviour of E&M fields. Actually I am trying to understand what is source of different force fields and how these forces act at a distance i.e. w/o touching. For this I imagine Space being made up of microscopic quantum particles of Mass, Electric and Magnetic charge. Free space has uniform density of these particles hence no force field. Presence of Mass, electric & magnetic charge changes the density of respective quantum particles in region of space which give rise to a force field. Higher density of quantum particles in region of space exerts outward force while lower density of these particles exerts inward force. Since these quantum particles are not visible they create an illusion of non contact forces. E&M charges have their opposite, they create attractive and repulsive force while mass has no such opposite, therefore it creates only attractive force. Each of 3 quantum particles move in each of 3 spatial dimensions. Electric and Magnetic quantum particles are also entangled. As E quantum particles move into a region of space M quantum particles move out at right angle (in different dimension). This is the reason for magnetic field around current carrying conductor. DC current initially moves M particles but motion stops and M-field becomes static once current becomes constant as an equilibrium is created b/w E and M particles and motion of M particles stop. To move M particles current has to change to vary the densityof E particles.To move E or M particles their density has to increase/decrease. This motion of E quantum particles moves electrons and induces current in a conductor. Electric magnetic and gravitational flux is made up of above quantum particles. For curved Spacetime and gravitational waves the field has to have a physical structure. I think these microscopic quantum particles provide the fields their physical nature.These quantum particles can carry & transfer energy. During formation of nucleus atom loses mass and energy. Loss of mass lowers the density of quantum mass particles producing inward force(nuclear binding force) which holds protons together despite their repulsive force. Higher density of quantum particles in heavier atoms (too many electrons, proton etc.) produce outward force which causes nuclear decay. Since these quantum particles cannot be created or destroyed matter and energy remains conserved. Loss of CMBR energy is due to loss of microwave quantum particles to space. Quantum particles can explain several physics phenomena.
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Thank you Bony, I hope this channel will help you re-inforce your understanding of physics.
Sir,
What are field line then
How can we describe them
Simple to define: An electric field line is the path that would take a positive charge placed in an electric field.
Put a positive charge in a field, its trajectory in space will be the field line...
So what is charge exactly, is it not particle but abstract concept?
Hello Avalon. Yes, a charge is not a particle. It is a property of a particle or body, and you can say that this property is carried by that particle. For example, electrons and protons are said to be "charge carriers". I published some time ago a short video that answers exactly your question. Check it out here: ruclips.net/video/8VN8MDn4CFA/видео.html
@@PhysicsMadeEasy Thanks, but still don't get what is charge, guy explains that its is measured in coulombs. Seems like darkmatter - it exists but it's not known what it is exactly.
charge is like something else which physicists name it a property but nobody knows what it is exactly because it does not have a mass (protons, neutrons and electrons). So now question is that if we do not know charge then how to measure it. To do this, physicists did experience that due to charge there is Force takes place. Then physicists measure this force (to measure this force you can see some videos in RUclips). After measuring the force they used SI units and came up with a numerical value as a result. This numerical value is in Coulomb. And finally the charge WHICH WAS AN ABSTRACT PROPERTY IN THE BEGINNING AND NOW WE HAVE ASSOCIATED A VALUE TO THE CHARGE WHIHC IS A NUMBER. So now you should se charge is a number or value. OBS: There are many properties which are like charge such as mass and compute mathematical values and at the end we associate these values to the respective property. WHY PHYSICISTS DO THAT? BECAUSE THEY TRY TO RELATE THE ABSTRACT THINGS (THINGS WHICH HAVE NOT MASSES) WITH THE MATHEMATICAL VALUES SO THAT WE CAN EMBED THE NATURAL PHENOMENAS INTO MATHEMATICAL LANGUAGE SO THAT FURTHER COMPUTATION CAN EASILY BE PERFORMED. @@sauroman1
You are amazing!!
No energy, charge, photons, waves, spin,fields etc. The expanding electron does it all.” The Final Theory: Rethinking Our Scientific Legacy “, Mark McCutcheon.
3 France jump scares aaaaaaah
👌👌 🇧🇩
Can this happen to a human as in electric field goes through your body ..hands.. arm. For several hours
We are continuously submersed in electric fields (Electromagnetic fields), of human origin and otherwise. Even our own bodies emit and functions thanks to electric fields. The light of the sun for example, is an oscillating electric field...
What can be dangerous is if the frequency of the oscillation of the electric field matches the resonance of some of the constituents of our body.
For example some microwave frequencies excite water molecules and heats them up, X-rays and hard UV are very energetic and electrons can get ejected leading to oxidation of molecules etc...
On the other hand, radiowaves and visible light are harmless...
@@PhysicsMadeEasy this "thing" went through my hands up my arms .for several hours i had to lay down it was so powerful if i turnd my palms toward the floor they reacted like magnet and flipped themselves over..it was terrifying . but i didnt seem hurt..
"An electric field is a region of space where an electric charge placed in that space experiences a force". Wow, that's the most awkward definition that actually says absolutely nothing about what IS the thing being defined, only what it DOES. Is this all that physics was able to achieve? It's like saying "An atom is a point of space that interacts with other points in space being atoms".
Well that's what it is! The Universe is not necessarily what you want it to be haha!
At the end of your comment appeared to be touched with a little irony. Well, it is actually quite close to what physics tends to say :-)!
Quantum Field Theory, which is at the base of of the very well tested particle physics theories, proposes that everything are fields, and particles are just fluctuations of these fields. An extension of it even proposes that particles do not really exist, only the interaction between points do, and we recognize / measure these points as particles... Particles would be an illusion... only the mathematical interactions would physically exist. So your ironic sentence was fun to read, although it would not apply to atoms but to fundamental particles (electrons, quarks etc...).
That's just the summary, which he then goes on to decompose and explain. I liked his approach myself.
Electric field is not region of space it is property of space.
Be careful with your semantics...
The property of points in space within an electric field is called the electric field strength...
An electric field is a region of space where each point have such property...
So an elephant is a field. Hm. "I do not think that means what you think it means" -Enigo
You have to clarify this for me Wes...
ayoo
This sounds like Making excuses. A field is a region assigned with a value, but how did the field get there, what caused it to be there, why is it there? No answers?
A field of people is there because people went there, A field of Land is there because Earth has land. But an electric field is there because it is There?
Your explanation is okay for doing calculations, but it doesn't really tell us anything about how, or why fields exist.
"How or why fields exist?"
hummm, let me think… got it: 42 :-)
The question answered in the video was ‘What is an electric field’ not “how or why field exists”… Your question deviates into existentialism: i.e. Why the Universe / physics behaves the way it is? No one has a clear solid answer to that… It’s a very interesting question of course, that drives all scientists, and humanity at a large.
Remember that a field is a model for our little human brains to make sense of things, and then to make models, predictions, and define useful applications. Do fields even exist physically? Maybe, maybe not? But it is a good intellectual starting point that can lead us to really explore “how and why they exist”, or not…
You define a field in terms of its effects, but not what it actually is.......
But isn’t something defined by its effect (or by its properties that lead to these effects)?
For example, how do you define an electron? It’s not a particle or a wave, these are just models we developed to visualise it. An electron is defined by all the interactions it has with its environment, thus its properties.
A field is a region of space for which each position is associated with a quantity (general meaning). The specific physical meaning of this quantity (related to a property/effect) provides the nature of the field.
That’s what a field is!
@@PhysicsMadeEasy Yes, I take your point. My issue is that scientists have and still do in many instances, strive to "materialise" the universe, looking for fundamental building blocks etc and scorning those who talk of the aether, yet all mainstream models are built from mysterious foundations that defy "materialisation" other than in their effects....Fields are part of that mystery; we only propose their existence in order to explain certain phenomena we experience....this can obviously be useful, but does not really show us what the universe truly is....maybe this is not a question for science....but then scientists need to recognise the limits to their discipline....
@@mfr58 The day science has answered the question "What is the Universe?", well you'll have a great bunch of suicides among research scientists that dedicate their life to that question lol!
More seriously, a scientist that affirms without self doubt "This is what the Universe is made of" is the opposite of a scientist... One of the foundations of science is to self-question and criticize itself when it gets to a result.
Scientists, the real ones, do recognize that we do not have all the answers. And they also recognize that science might or might not have the power to provide them. We just don't know... And that is the fun in it, which keeps us going!
@@PhysicsMadeEasy Glad you support science rather than scientism and with good humour too!
You have not even tried to update your knowledge.
???
But you didn't say what is an electronic Field at all,,, wasted my time
Hello Mohammad. Read the title: This is about electric fields, not electronic fields (I supposed you refer to Quantum Field Theory when you mentioned electronic fields) .
@@PhysicsMadeEasy when did I say electronic Field?your explanation so dull and confusing,,have listened to it yourself? Shall I explain it to what an electrical field ,shall I ? Then you will learn what is an electronic Field