Maxwell's Equations and the Speed of Light | Doc Physics
HTML-код
- Опубликовано: 11 фев 2013
- Gauss's Law, Ampere's Law, and Faraday's Law! Maxwell combined them all and proposed a beautiful symmetry that was later confirmed by a clever experiment. Awesome.
i'm 34 and i can't wait till i grow up,so i can understand this.
Shortcut 12 eventually we'll both understand
speed of light (lightyear) is distance light traveled in 1 year.
Relax, dude! Arthur Ashkin won his nobel at age 96. We still have a chance...
@@valmormn I like that misguided optimism :D
it's better to watch Richard Feynman videos. they are teaching us an interface,
not the meaning, as in, what is actually happening physically
I was injured and missed the last two weeks of my electricity and magnetism class, and I have been trying to learn the material I missed on my own by reading the textbook. After probably two hours of reading, I still couldn't get it, but after five minutes of you explaining a t-shirt this finally makes sense. Thank you!
Whoever disliked this found the magnetic monopole. otherwise there is no reason to dislike this video.
Hahahahaa.... you're so funny mehn....
People who don't like videos or explanations like this, don't like it because they don't understand it. I see it all the time. They have no curiosity and they are irrelevant.
He speaks too quickly. -_-
😂😂yup...lol
This is one of the funniest, most enlightening explanation of a fundamental tenet of physics. The fact that it has only 22K views (vs 2000K for Kardashian's latest), and 2 dislikes speaks volumes for the state of our society today.
David Sica That's really nice of you to say! You've really got to hand it to society, though - my butt is a lot less interesting.
perhaps this too
I think because people watch RUclips for entertainment and not science.
@@DocSchuster I doubt that! HAHA!
200k now
Brilliant explanation! Love the little touches of humor
awesome! found my passion for science, physics, math and chemistry a couple days ago. learning as much as I can in my spare time. wow, so awesome
It's also worth pointing out that the equation says nothing about the frame of reference so all observers will see light moving the same speed and off we go into special relativity!
That is a VERY nice observation! Thanks, Will.
OK, then. But if it did say something about a FofR, just how would it be represented? If it did. Or was.
You make physics so interesting. Why am i only finding you now.. the day before my final.
Anna Marie Dimapasok Shoot! I'll be around next semester, anyway... You'll just have to take more physics!
I feel like you appreciate this video more after you get to learn each equation separately , cause this video is so good in bringing it all together to help you get the big picture , thank you.
mind=blown. physics is awesome
This might be the greatest video on RUclips.
OMG you rock! Crammed so much information in so little time I don't know how you managed to do it and still make me understand it!!!!!
What isn't clear in this video is that before Maxwell, people had already got a moderately accurate value for the speed of light even tho they didn't have a good theory for what light was (Google; Jupiter's moons speed of light). So in fact Maxwell recognized the value for the velocity of his electromagnetic wave and surmised that light was also an electromagnetic wave.
Just saw that clip and loved it. BUT is it not really important to mention(id say to keep it nice and short without digressions).
That Jupiter moon clip says that the 17th century dude came PRETTY CLOSE considered the crude tools (and guesses he had to make). He was "only" off by half (he though 200.000.000km/s).
Anciebt civilisations also could do things with light in temples that demonstrated they had grasp of the idea of planetary distance, relative angles to predict the successes that i speak of.
I looked up jupiter moon speed of light. Now you look up "abu simbel temple light aswan dam" and one of the first google hits must be what im talking about.
Cheers
Dr. Schuster, Thank you so much! I think I have watched all (yes all ) your videos now, and I'm a senior undergraduate student.
you're doing something that no ordinary person does, thank you so much.... you deserve a nobel prize. I will see you some day and thank you in person! you're great......
Love this explanation. The equations are so elegant!
you r awesome man and you really doing good thing by teaching in here on this platform....education is lot more fun and easy access now ...god bless you ...thanks so much ...
I found a monopole, it’s called marriage where no opposites attract
All if your videos helped me a lot! Thanks so much, sir!
Gauss (x2), Ampere, and Faraday laid out the premises; Maxwell completed the expression and connected the dots. Absolute impressive genius.
You're very kind. Thank you!
awesomely explained you are one of my favourite lecturer in video teaching
this is beautiful!!! Really helped my understanding, thanks
This is a really nice compact explanation but it would have been worth mentioning that the form of the equations presented here was the work of Oliver Heaviside after he had simplified Maxwell's original equations.
Thanks for your excellent explanation. I understand it better now than after I took the emag class years ago.
"Dangggg, thats a really high speed!"
-Mr. Maxwell
Lolll I love it
I have a physics final tomorrow and this now gave the the inspiration to look further into Maxwell's equations.
Btw, I passed physics
@@aaronhanson5014 congratulations mate!
Amazingly explained,i just need to do some revision and that helps ,thank's. We need geek guys like u.
Thanks! Those are closed integrals, indicating that the integral starts and ends at the same place.
Lovely explanation! Elegant and funny at the same time.
Wow....That's awesome !!!
That's the most fun I have ever had listening to Maxwell's equations even as a postgrad student.
Yay! That made me smile, sir!
I love your videos! really helpful for gen physics 2 in college!
nice presentation(s) :)
so that is what the sparks are , when we join a wire on a working circuit !
you sound so passionate, reminds me again why i love being a nerd: science is (sorta) fun yay!
Brilliant video 👍
That was nice.
You can take two electrons or protons with some equal Velocity traveling in the same direction and next to eachother at some distance "r" and set the Electric Force = Magnetic Force equal and when you shake it out, the Speed of light "C" pops out. This shows the speed of the force travels at the speed of light "C".
That was a really great explanation!
Sono Sal Thanks! Those are really great sunglasses!
Great explanation. Thanks. May I ask if this formula also says that the speed of light is constant even if it originated from an object travelling at a different velocity than the observer?
love this video thank you
Hey there! You are amazing! Thank you very much for making me understand these equations. All I have is one question. What's the first symbol you're using in front of every equation?
If you've watched them all, then YOU WIN! You're my biggest fan! Thanks so much for the support. Keep studying physics, and look me up if you're in St. Louis.
this guy is amazing
Awesomely explained, engaging video!
Great great video dude!
Love this video
You really are amazing !
OMG! I gifted my brother a T shirt that had the same thing written on it!!
Well Presented. Subscribed
Ditto
Hey, you directly jumped to saying mu * epsilon = 1 / sqrt(v), how did you get there?
So Cool!
Incredible
best explaination thank you
A recent radio wave experiment shows light propagates instantaneously in the nearfield and reduces to the speed of light in the farfield, after one wavelength is also another discovery that will radically change our understanding of science, in particular all of modern physics. In this experiment,the time delay of signals was measured between 2 dipole antennas as the antennas were separated from the nearfield to the farfield. The results showed that the radio waves (light) propagates instantaneously in the nearfield and reduces to the speed of light in the farfield after one wavelength. The matches perfectly with theoretical expectations using Maxwells equations by setting the wave equation to a source term. This corresponds to not only the phase speed and group speed, but also the information speed. These results are completely incompatible with Special Relativity, which is based on the speed of light being a constant c. Inserting c=infinity into the Lorentz transformation yields Galilean transformations, where space and time are absolute. This shows that if an inertial moving object is observed using instantaneous nearfield light, then no time dilation , length contraction, or simultaneity Relativistic effects will be observed. So if Relativistic effects are observed using farfield speed c light, then by simply flicking a switch, one can change the frequency of the light, such that instantaneous light used instead, and the effects of Relativity would go away. This shows that the effects of Relativity are just an optical illusion and that Galilean Relativity is the correct form of Relativity.
Here is another very powerful argument that shows Relativity is based on a logical fallacy. According to Relativity, observers on a moving train and on a stationary train platform will disagree on the size of the ""Train"" and the passage of time on the ""Train"". This is a complete logical contradiction if the size and the passage of time of the train are real. If the size of the train is real, then the ""Train"" can not be both contracted and not contracted. The same goes for the observed passage of time on the ""Train"". If these effects are observed, then the only possible conclusion is that it is an optical illusion. Things that are real must appear to be same from all frames of reference. If not, then by definition it is an illusion.
Again the argument is very simple and it is the argument Einstein used to derive Relativity, and no acceleration is used in the argument. A train with length (L) traveling at constant velocity (v) relative a stationary observer on a station platform. According to Relativity, the stationary observer will see the train contracted (L/r, where r is the Relativistic gamma), whereas an observer on the train will see it not contracted (L). So the train is both contracted (L/r) and not contracted (L) depending on the observer. This is a complete contradiction (L not equal L/r) and can not be true if length is real. The same argument applies to passage of time on the Train, where both observers will disagree on the passage of time. If time is real, it can not be both dilated and not dilated (T not equal rT). If space and time are observed to be both large and small simultaneously for one inertial reference frame, such as the ""Train"", then it must be an optical illusion.
It should be noted that experiments proving Relativity can only give evidence that the theory may be true, but an experiment disproving Relativity, or a logical proof showing a logical fallacy in the theory can absolutely disprove the theory. I have provided both.
Since General Relativity is based on Special Relativity, General Relativity must also be an optical illusion. Spacetime is flat and gravity must be a propagating field. Researchers have shown that in the weak field limit, which is what we only observe, General Relativity reduces to Gravitoelectromagnetism, which shows gravity can be modeled as 4 Maxwell equations similar in form to those for electromagnetic fields, yielding Electric and Magnetic components of gravity. This theory explains all gravitational effects as well as the instantaneous nearfield and speed of light farfield propagating fields. So gravity is a propagating field that can finally be quantized enabling the unification of gravity and quantum mechanics.
The current interpretation of quantum mechanics makes no sense, involving particles that are not real until measured, and in a fuzzy superposition of states. On the other hand, the Pilot Wave interpretation of Quantum Mechanics makes makes much more sense, which says particles are always real with real positions and velocities. The particles also interact with an energetic quantum field that permeates all of space, forming a pilot wave that guides the particle. This simpler deterministic explanation explains all known quantum phenomena. The only problem is that the Pilot Wave is known to interact instantaneously with all other particles, and this is completely incompatible with Relativity, but is compatible with Galilean Relativity. But because of the evidence presented here, this is no longer a problem, and elevates the Pilot Interpretation to our best explanation of Quantum Mechanics.
*RUclips presentation of above argument: ruclips.net/video/sePdJ7vSQvQ/видео.html
*Paper it is based on: William D. Walker and Dag Stranneby, A New Interpretation of Relativity, 2023: vixra.org/abs/2309.0145
Dude you are awesome!
Thanks, Will! So are you!
Awesome! Do you have anything explaining how this fact leads to Einstein developing the relativity theory?
Hi, thanks for replying. I've had a look on Wikipedia and I think the relevant SI units were named 'after' Coulomb. I'd like to know (and I don't know the answer) which scientist was the first to derive any of these tiny or huge numbers from their theories which in turn lead to the figure for the speed of light and everything else..
Cutee....physics.😄..really loved it😍
From.india😻
you voice is similar to neil patrick harris ..
Thank you.
Awesome insight, explanation. Answer to 2: Hubble Shows Light Echo Expanding from Exploded Star Light from a supernova explosion in the nearby starburst galaxy M82 is reverberating off a huge dust cloud in interstellar space.
The supernova, called SN 2014J, occurred at the upper right of M82, and is marked by an “X.” The supernova was discovered on Jan. 21, 2014.
The inset images at top reveal an expanding shell of light from the stellar explosion sweeping through interstellar space, called a “light echo.” The images were taken 10 months to nearly two years after the violent event (Nov. 6, 2014 to Oct. 12, 2016). The light is bouncing off a giant dust cloud that extends 300 to 1,600 light-years from the supernova and is being reflected toward Earth.
"...and you KNOW what he was talking about right?" I got so excited I said "hell yeah I do"
My particle physics professor suggested that there may be magnetic monopoles in condensed matter physics
Your Amazing! :O
awesome
GR8 Review/ Fantastic video
The monopoly guy's cane is a monopole. Nobel prize plz.
Hahahahahahaa
Nice video and presentation.
Is it fair to say that the prerequisites for light propagation are e0 and u0?
Also that e0, u0 are attributes of light medium, Aether?
Also that c isn’t a constant, instead is dependent of u0 and e0?
Also that radiating solar wind increases the permittivity and caused a permittivity gradient around solar responsible for a velocity gradient of a passing light and hence bends it? That gravity bends light is out of ignorance in Aether ?
I would be happy to shake your hand as well. Thank you for your support. Keep up the hard work, but be sure to go outside to get some fresh air once in a while. Maybe run 5km?
5:29 tshuu tshuu tshuu
thx for the video man =)
I love the way you tell things. However here the last equation's left hand side is amperian loop not the second last equation's.
FWIW, Einstein put Maxwell's work as one of the most significant underpinnings of his special theory of relativity.. He says that he may not have been aware of the results of the Michelson-Morley experiment that found that the speed of light was the same regardless of your frame of reference. when he developed special relativity. He also says that he would have been very surprised that the speed of light was not independent of the frame of reference because of Maxwell's work and that the Michelson-Morley results were what he expected.
Fair enough, I like this video. you explained the equations briefly however I still don't understand them for one. two I don't understand what the symbols stand for and three, What are the units for all these symbols and equations? I'll try find out on my own.
What does the circle on the integral sign mean?
thnx 4 this m8
I tried understanding this by attending a lecture at Yale where the professor dwelled off for 30 minutes about wavelength finally reaching the first equation by the end when all I had to do is watch this 5 minute video to understand the basics
What does d in the first equation stands for??
Einstein had a portrait of this man on his wall!!
Pity most of his countrymen and women today think Maxwell's Equations is an assortment of chocolates!!!
So how were permativity and permability measured experimentally?
How to derieve this equation of velocity of light from 4 equations??
I think that the fact that magnetic fields are the effect of the relativity theory applied to electric fields is a good way to understand why is impossible to have magnetic monopoles, would be like loose one direction
Fun question! I'm guessing Oersted and Coulomb because they both determine the strength of forces. Check me, though. I'd like to know the answer!
You know I'd take care of you!
If magnetic monopoles were ever found, the Faraday Maxwell equation would need an extra "current" term for the flow of magnetic "charge" and the E and B fields would become exact mirror opposites.
Thanks alot of.because thr teacher asked me this question how to proof speed of light?
Where can I buy this t-shirt...
7 years?
Where were you ?
Good video, but I did not understand how you got that E0*M0=1/V^2
What about the fourth equation ? It says that changing electric flux is inducting magnetic field, but what about constant electric flux? Electromagnet is inducting magnetic field, although it is connected to DC.
What is flux? And E.dA and E×dA what does it mean
great
If I understand “Kathy loves physics and history” correctly, these are not actually Maxwell’s equations, but a combination/ reduction of Maxwell’s numerous equations contributed by Heaviside.
is it possible Q=a*v (static is precess of accelerated velocity)
and m=Q*a*v (mass is precess of a current loop)
energy being dynamic as ((cos+sin)^2)^(1/2) cos=magnetic sin=static
and in essence mass is "phase frozen" energy at nodes on this wave graph?
I don't understand this but I would love to begin to learn. anyone have suggestions on where to start? I'm a fast learner and haven't got to these equations but I just need to begin to understand this.
+TwoTacosForPaco
if you really want to learn this, i recommend start with learning circuits. Because it teaches how electrons behave, then go with electro magnetism. He has a playlist in his channel.
I know your comment is from last year, but... here's my two cents:
Start by learning/looking up wave equations and oscillations. After that, get to know the basics of Einstein's Special Theory of Relativity.
These are some basics you'll need later. Then look up electric and magnetic fields (as well as electric circuits).
As you do your research, you will automatically come across the Maxwell equations (the ones from the video).
In the end, you can combine these equations to get something similar you learned from wave theory and there you go.
(That's basically a whole semestre of Physics II, so you could also just decide to visit some lectures in a nearby uni)
Have fun!
i get late, but here even someone who does not understand math can learn c: ruclips.net/video/XtMmeAjQTXc/видео.html
physics. I was forced to learn this in school. 2nd year uni. So jump to that
Learn the math behind it, including a bit of calculus. Then read the pertinent chapters in a university physics textbook, building what you need to know first, and work as many homework problems as you can. What to do next will become obvious. This gets really deep, so don’t expect to understand it that well in a matter of days or even weeks studying daily. But it’s totally worth the time.
My man said he will share the nobel prize if you find it, lol...
And i thanks for you so much.
Derive an equation ,speed of light
he didn't put(the additional term in the fourth equation) by there by symmetry but by charge conservation!
Could a monopole be in a torus shape?
Light has a constant speed in vacuum of space, and a different constant speed in water etc.
So, a light coming from a car standing still is same speed as light from a car that is moving,
because also in the atmosphere light-speed is a constant?