question about Ampere's law in vacuum and in matter

mfb

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.

mfb Recognitions: Homework Help Science Advisor	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.