Possible interior fi elds 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 = −∂B∂t 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 material is.
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