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mfb
#4
Nov14-12, 08:34 AM
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P: 11,570
Question about Ampere's law in vacuum and in matter

Add the assumption that ##D \propto E##, and it works.

In general, this can be wrong, but I don't know if the regular Maxwell equations work there at all. If ##\epsilon_r## is a tensor (or nonlinear), things can get difficult.