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Your two methods look correct. I did catch a spot where you have two compensating errors: Check the signs in this calculation...

Yes. Nice analogy.

We're in the same neck of the woods as where there's an apparent paradox with the energy before and after a charged capacitor is...

A number of teachers have been interested in collecting the black and white films that were part of the PSSC program in the 1960s. Many...

Good. If you wish, you can post your work for ##\nabla \mu## and we can review it.

If you release the block from rest at the position where it starts to submerge, then the only two forces doing work as the block...

Is this taken directly from your teacher's PowerPoint slides? Does it represent your teacher's solution to the problem of post #1? Are...

This problem is not the same as the one given in your first post. It appears to be totally unrelated. You mention your teacher's...

Besides the error pointed out by @anuttarasammyak, check your work for the following: I get an additional term proportional to...

Your homework statement mentions dielectrics. But the actual problem statement does not mention dielectrics. It's not clear to me...

It appears to me that Callen’s deduction of ##dQ = T dS## for quasi-static processes is essentially contained in sections 1.8 and 2.1...

Hey guys! Sorry for jumping into the thread after so long, but I came across a link that might be of interest to you. I recently...

@palaphys, for an intuition, it helps to visualise flux lines. In the following diagram, the magnitude of the flux through the loop due...

As was pointed out by @QuarkyMeson, no, because it is only part of the field. However, Maxwell’s equations admit causality-reversed...

Longitudinal electric field isn't an observable, E is. (Save some electrostatic near field stuff when E is approx ##E_{\parallel}## and...