7 Differences between Electric and Magnetic Field

Books by Alexander Fufaev:
1) Equations of Physics: Solve EVERY Physics Problem
2) Alexander Fufaev and His Never Ending Story:

[angeldude]

"A Magnetic field, on the other hand, is generated ONLY by moving charges." So all you have to do is move at the same velocity as the charge and the magnetic field mysteriously vanishes, disappearing into the electric field. Because the two are just different parts of the single electromagnetic field, and which parts they each are depends on your frame of reference.

[TrueNoxus]

I don't know how YouTube finds me these little but highly interesting and well researched Videos. 8 Years of German Physics classes couldn't teach me what you did in 2 minutes. Keep it up!

[Przemox]

One of the best science channels on YouTube. It's pure gold for me as an engineer. Thank You, Herr Alexander!

[recifebra]

you're really good at consolidating into the really important things! great work!

[helmutalexanderrubiowilson]

Noo!!.second video and i already love this channel. You got me man. I suscribed

[nicholasbohlsen]

As a note, its not actually true that magnetic field lines have to close. (the following discussion is entirely magnetostatic so the field lines are well defined)

This is often called a "textbook error" because it is actually stated in many introductory texts in E&M but is just false. It is possible for B field lines to scatter to infinity (but does require infinite global current and so this is not really interesting). The more interesting case is when they remain contained in a finite volume but never close on themselves. Instead field lines can form an arbitrary aperiodic path within the volume, constantly looping back on themselves but never actually quite returning to the same position and so never closing.

Plasma physicists often call these "chaotic" or "stochastic" fields (they are actually studied with the theory of hamiltonian chaos) and they actually the generic behaviour. A random current density will generally induce a stochastic field. The reason we do not see these configurations in a first course in EM is that all of the configurations of currents you would look at in a textbook have some level of underlying symmetry (infinite line currents, small circular loops, e.t.c). Any continuous symmetry of the current density will reduce the dimensionality of the problem by 1, from a 3D problem to a 2D one where the field lines have to close, so we see closed lines in symmetric configurations but for arbitrary asymmetric ones will see chaotic fields.

[jan-willemreens]

...Good night Alexander, I hope you're doing well. If you still have not been able to convince the viewers of your explaining abilities with this presentation, then I am at my wits' end. These videos should definitely be watched certainly by students. If I had had this option in my time at school, it would have saved me a lot of valuable time! Thank you for another great job and well spent time watching your short but powerful video! Take care, Jan-W

[dikshitadikshita]

I am from India. I get all the concepts very clear from your videos.

[鑰恩曨]

I'm so glad I found your channel, you explain things so well. Thank you <3

[rezaapply]

Isn't this wrong (time: 2:02) "The magnetic field does no work on the charge even when the charge is moving"?

[techiesithastobetechies.]

Thanks!
This makes a lot of things easier to remember!

[mangojuice]

Very good explanation especially point 6 that's the entire theory behind cyclotron

[curiodyssey]

dude. absolutely fascinating. great content.
however, if I may suggest one thing, number 5. in my opinion, can definitely use more of a deep dive in terms of an explanation.
I'm not naive to physics by any means, however I'm also nowhere near an expert. that's basically why I'm here watching, because I crave new knowledge in the field of all things science. physics in particular.
however, I found myself at the end of number 5 legitimately lost, which doesnt happen very often. dont mean to sound arrogant, though I may not be proficient in every subject in every field, I do have a working knowledge I would say is more robust than your average person when it comes to the content in your videos.
so can you please break down number 5 for me so I can learn something new?? thank you!!!

[frizzarazz]

But something like an electron does react to a magnetic field because of its spin, as can be seen in the Stern Gerlach experiment. Are there any electrically charged particles without spin that we know of? Otherwise they would all interact with the magnetic field. They don't interact directly with the magnetic field because of their charge, but maybe indirectly if their spin is somehow caused by or shares a cause with their electric charge.

[spaced___x]

0:50 So that's why the divergence of a magnetic field is always equal to zero

[stefano.a]

The problem is that B in the International Standard ISO, is called Magnetic flux density or Magnetic induction.

The magnetic field intensity is the vector H that measures in A/m . (The electric field measures in V/m )

[LionKimbro]

A moving charge is not actually moving, if you're moving right alongside it...

[_wahahaha]

Wow! This is what people call short and sweet ❤❤❤

[firstnamelastname]

1:20 Shouldn’t that equation be F = qv X B? (Cross product) Please correct me if I’m wrong

[zdlax]

This means E = B up to s/m. Everyone understands m/s as speed but what is its inverse seconds per meter? The flow of time in a region of space? I really like thinking deeply about dimensional analysis.