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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.

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Electromagnetic fields of a spatially bounded time-dependent current which is eventually steady

So here's the set-up: I have a loop in space and fix a point $p$ outside the loop. Then I turn the current on at $t = 0$ (so the current profile is a step-function). Initially at $t=0$ the E&M fields …
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1 vote
0 answers
185 views

Lagrangian of a piezoelectric material

I am confused about the Lagrangian of a piezoelectric material. I have seen multiple sources that seem to contradict each other. The way I personally approach the problem is the following: $$L = K - …
Leonid's user avatar
  • 395