TSny's latest activity

I'm a bit rusty so forgive me -- but in both of those examples, the magnetic field ##\mathbf{B}## is a constant* (in the lab frame), so...

I used the approximation from the 3,4,5 triangle. Also, no I am not familiar with lagrangian mechanics I'm still in HS. Here's the...

👍 I get the same result. I found the calculation to be fairly tedious. Easy to slip up.

In your example in post #1, ##\large \frac{\partial A_y}{\partial y} \neq 0## for points along the x-axis. So, ##\nabla \cdot \mathbf{A}...

That's not the reason. The assumption is more general. Free charge inside the volume of a dielectric material would have to be...

Intuitively, the reason that ##\sigma_b## is negative is because the field of the positive, external charge ##q## tends to pull negative...

@kuruman has addressed your questions. But I’ll add a few additional remarks. There are two sentences in your quote. Are you asking why...

Let's take another look at your nice steady-current calculation in #5. You considered an arbitrary point ##p## at a distance ##r## from...

Yes. Thank you.

The flux through the spherical surface without including ##\partial_t A## is ##(q_o-I_ot)/\varepsilon_o##. The flux of ##-\partial_t...

I used Mathematica to plot the field. I definitely agree. In the case of opening the switch, you have resolved the apparent paradox...

This all sounds good. If the current is switched off by opening a local switch, things are quite complicated, as you have very nicely...

Good. Yes, I think so. Your two different graphical solutions with three reflections are very insightful!

Your diagrams appear to show 3 reflections before the rays form an image at S.

How many reflections are you considering?