Magnetic field created by a current carrying wire | Physics | Khan Academy
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- Опубликовано: 31 июл 2008
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See how a wire carrying a current creates a magnetic field. Created by Sal Khan.
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this guy should start a new series: How to draw hands
I love how you WANT to make us understand, it feels like my teachers just want to get their job done, as if its tedious
Quantum mechanics has attempted to explained the phenomena of magnetism by excluding Ether from the scientific community. However, many scientists have argued that this exclusion is not justified because quantum mechanics cannot account for the basic principles of electromagnetism. For example, quantum mechanics cannot explain how a current carrying wire creates a magnetic field.
I can't get a hand that good by drawing on paper, and this dude just straight up draws it with a mouse.
Low dpi
@@nokigaming6651 Probably a stylus maybe ?
It’s a graphic tablet
Pen tablet
Who else mugging these up at 1.25x speed (it still sounds just fine ) a few hours before exam?😂🔫
me
Epic, thanks for the tip
Just now xD
1.5x speed :D
me
If the magnetic field direction sketches explained at 1:50 still doesn't make sense, try to imagine a moving dart. If the pointy end is moving towards you, you only see a dot. If it's moving away, you see the cross from its fins. This obviously applies to current or anything else directed"into" or "out of" the board.
Wow,a ton of thanks to you.
can you elaborate please
as in how can you determine the direction of it
Quantum mechanics, the theory of the very small, has never been able to explain the phenomena of magnetism. Magnetism is created when a current carrying wire creates a magnetic field. But quantum mechanics doesn't allow for fields that are not controllable by particles. So how do we explain the magnetic field created by wires? The answer lies in the Ether. The Ether is a medium that permeates space and is thought to be responsible for creating and holding together Magnetic Fields.
You would see the fins regardless of which way it is going
@@showshowtomakefreeenergyge2426photons are the carriers of the electromagnetic force and the clear answer to your problem. The ether is not required and can be considered synonymous with space
Such a genuine, honest, and talented individual. I wish everyone in the world was like him.
"For your highschool physics class..."
but what about my college physics with vector calc class lol
I love Vector Calculus
Finding the total fluid force on the hemispherical tank amounted to computing
a new kind of integral over a surface, or surface integral. As our course develops, we'll see a great need for integrating both functions and vector fields over nice surfaces like the hemispherical tank.
Because of the complexity and importance of surface integrals, we'll have a whole chapter devoted to them. That same chapter also builds from scratch the Divergence Theorem, one of the most important results of our course.
In the next unit, we'll use what we learned apprenticing for Mr. Adams at Tanks For All The Fish to begin to understand the depth of this remarkable theorem.
Not a native english. Thought I would not keep up with the video, but you actually explain very clear and understanding. Thanks.
KonesThe yeah exactly...if u watch the videos of crashcourse physics u feel a lot of difficulty in understanding but literally hank greens accent is so vivid
@@heatherbloom5426 this isnt Hank greens tho
3:05 Soooo cute!!!!
I have my exam tomorrow and my teacher explained this is the most un-understandable ways!
you saved my life!
thank you!
Cool. Had this in physics class a couple months ago, now it makes even more sense.
you should quit youtube and be a professional artist . that hand you drew was on point lol
he can quit utube & do a tons of things :p
Dan 😁😁
Sal Khan is the Picasso of hand drawing
Lmao
He was actually a cartoon artist for his town growing up. he says it in another video lol.
English is not my first language, I find it difficult to talk with people or understand what they say, but you explained it beautifully, and my doubts are cleared now, thank you Khan Academy :-)
Sal I cant wait for your 5 part video on integrating Maxwells wave equation!
Sir, let me take moment for truly appreciating your digital hand art so perfect 🙆🥴
Thank you for the method!
Wow I was getting hyped for all the comment praises for a hand he’s gonna draw, and I was not disappointed 😂👏
@@felixwang2539 😆👍
dude i have to say, i loved it, i actually knew this stuff but you make it so easy to learn, appreciate the video a lot.
This concept has been in use for many many years. Scrap yards use this exact same set up.
Thank you so much ! U solved my problem in not more than 3 minutes 😇
"That's why you don't have metal objects being thrown around by the wires behind your television set"
Hilarious! :D
How is he so smart?
pffft he a dummy
He's a teacher bro
Does the intensity of the mag field associated with electron x, move along the wire with electron x? So it would be like a spherical field force moving a foot with every foot of distance moved by electron x?
But if electron x causes a mag field, this field is not affecting the electron field in the previous second so it seems like it creates a huge undefinable mess of electron fields that cannot be rigorously defined.
Great teacher and a greater artist! Had such a hard time understanding this in lecture but you made me understand it within less then 10min. Thank you!
how to demonstrate the expression you wrote of B created by a wire please?
Is r measured from the edge of the wire or the center. I'm assuming center. My applications involves using several laminations of copper
In headphones, how does the current flow affect the magnetic poles in the voice coil?
14 years and video is still gold!
how come iron filings arent affected by the magnetic field of the wire when i try it out ?
Does the shape of this magnetic field that disipates based on the radius from the moving electron, form a sphere by adding up growing and shrinking concentric circles?
Your English is excellent. I would never know that you are not a native English speaker.
Spectacular explanation
than you.
how do you know everything
bruh honestly
a little explanation to the formula B=u0 i /2 (pi) r....
using gauss' theorem's equivalent in magnetics..(Ampere's Circuital Law)...
B.dl=u0.i in gauss law we had..E.dS=Q/e0
so in this case..
B.(2(pi)r)=u0.i dl=2(pi)r for a circle(circumference)
we have to find B...
B=u0.i /2(pi)r
wow the drawing skill lol, great video
thanks
it helped me
omg the drawing is so nice
Can i find M permeability in casio fx-991ES plus ???
V nice 👍
can i just say you are really good at art considering your using a tablet which are hard to use XD
Lovely lessons!
Oh, im going to make the hand blue....very professional ;)
Thanks!
Sal could you (or maybe someone else who knows) tell me where I can get that TI85 emulator? Is it commercial?
is the mu relative permeability or magnetic permeability?
Направете превод и на български, вярно е, че много от нас знаем английски в достатъчна ст-н, но един вариант на същото това видео и с български превод, би бил много-, много по-разумен! И ще постъпите доста по-конструктивно, когато създавате едно такова видео, като го "снабдите" и с български превод ПО НЯКАКЪВ начин, хора!
If the subtitle were in English, it would be easier to understand, please consider that!
God bless you
Seal is an artist
Good
We assume mu (U¡=4pi * 10^-7 T m/A
salman thank you
شكرا سلمان
we should think about protons and neutrons if they have a moving what it makes the current the reason they make the current because of motion of protons and neutrons .
God Sal is a great drawer
is it bad if i watch these for fun...
NO NEVER THINK THAT!
Jason Dove yes
That's great! What makes you think it's bad to watch them for fun?
Yes, nerd
I think the wires would repel each other.
khan is great
Also, did you know we can create charge through magnetic field because of induction?
What will happen if I place a magnet in this kind of magnetic fields?
Jasman Gill, left hand rule is different..
@cheese0cake Right hand rule relates to Protons, conv current deals with protons. If you use left hand rule, your dealing with electron flow
first rule of right hand, you can also imagine yourself opening a bottle of water for example in a certain direction in goes up..
None ofurbusns ya thats known as screw rule
outstanding nd easily digestable example of a bottle
cool
So helpful, man. Thank you.
This also works to describe how coherent self-awareness would go about looking at itself and how energy is in flux because it can't be created or destroyed. The universe being one of those concentric circles.
Energy/magnetism = vector self-awareness
+Alex James do you smoke crack?
+Nitish Chauhan thanks for bringing my attention back to this video. This guy is amazing. The mechanism that's happening is not one of self-awareness. It's one of experiencing the procedure of expatiation. That's the side-effect of the fusion of the electric current and plasma. Space is spinning counter clock wise while time is spinning clock wise. That's the result of positive and negative charges behavior in a vortex.
you have a lot fun doing that don't you
+Nitish Chauhan Physics? Yeah, because it coherently explains the Nature of Existence.
dude do you just say shit and hope people won't understand that everything you write is complete bonkertown?
the constant is 1.26 x 10^-6 and pi is 3.14
how then are you getting a repeated 1.3333?
I plugged in those numbers and got 1.19 x 10^-7
You sound like Mircrosoft Sam. But you're awesome.
What is this "mu" that looks like a "u'!! you rock sal
just fyi Uo = 4pi × 10^-7
The result you used is only true when the wire is infinitely long. You
Should have mentioned that.
please i want to know why the magnetic field created around a wire
sa breen no one knows this uptill now.faraday when asked about this said it was a miracle
On the website this is embeded on its only in 360p but here its only in 240p it makes no sense. :S
We were taught at school it left-hand rule lol
I assumed there wouldnt be a video on this because of the black platform and lack of hands..I stand corrected
one question
is there a symbol x in circle denotes inwards whiole the . in circle denotes outward curent
Yep
Hmm if a coil is producing this field, how can I use another coil to pick this magnetic field up? I don't want to receive the electric field but the magnetic
What is the physical reason why the field spins counterclockwise to the current's direction?
+MisterSinister A current in a wire creates a magnetic field. Using a compass you can see that field and find its direction. To help figure out the direction Ampere has created the right hand rule. It's just a standard rule so everyone follows the same convention and agrees on direction. Check out right hand rule on wikipedia for a demo.
ccmiint Yes, I understand it is merely for convention now.
+MisterSinister I believe it is something no human knows why. We just observe the thing. ccmint's answer isn't answering your question in a sufficient way.
EmirhanMW2 It is just convention, meaning there is no actual reason. It's just so everyone uses the rule the same, like labeling one direction left and one direction right, even though there is no real difference.
+MisterSinister Excuse me but, as matter apparently doesn't have it's own mind, then it actually matters whether a current carrying wire throws you counter-clock wise, or clockwise.
A person should ask, why does it go counterclockwise, and not the other way, isn't it the same thing?
I don't think it is a 'convention', but rather, an observation.
I thought you're supposed to use your left hand for wires??
I created a RUclips account just so I could like your videos
@Ardi1589 i think it is
watched
@Ardi1589 yeh i think so
good job..
salman sir had a hidden talent of art......😆👍
Ok it's better.
So cool thank you so much sir
+
Uo=4pi*10^-7
I thought it was Epsilon 0
that right hand drawing though hahahah nailed it!
How do we know which way the current is flowing? Does it flow from positive to negative or the other way around?
Damn, I discovered your videos in the middle of the summer semester and I wasn't able to catch up. I just finished my final yesterday. I wish I found you sooner. But atleast I'll have you for Calc2, Economics, and Linear Alebra, right? RIGHT? :(
Bla bla bla
Hahahaha "These are the veins on my hand" killed me! xD
TI-85 is so last decade
Didn’t know I was watching art class
Does it matter if the current is carried by holes or electrons? The direction of the field would still be the same? I know current direction would be the same, I am just wondering if this theory is valid for both cases.
@darkshadowz1994 Do you still have it?!?!
Its disturbing when u keep saying "i dont know" throughout the video
A very simple issue explained in NINE minutes....LOL
I have a doubt whenever I try to define the direction of the magnetic field B: in the wire's plane the direction would be k (defining k as a unit vector that comes out of the page). But if I want to know the direction at all points, should I define a unit angular vector in cylindrical coordinates?
Khan Academy
U thought it would be poor but u mde me understand
IS THE CURRENT D.C?