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Possible interior fields

We are going for definiteness to make medium 1 the perfect conductor. In this medium

there can be no electric field, either time-varying or static, and thus no electric flux density,

either time-varying or static.

Because curl E = -aBat there can be no time-varying magnetic flux density B and hence in this assumed linear medium, no time varying magnetic field H. There can however be a steady magnetic flux density B and magnetic field H. In practice these fields take a long time to establish or to change to a new steady value, the time depending

on just how large the conductivity of the materiał is.