A magnetic field B(z, t) = y B 0 cos t is applied just outside the lower
Question:
A magnetic field B(z, t) = ŷ B0 cos ωt is applied just outside the lower (z = 0) surface of a semi-infinite slab of ohmic material which extends to z = ∞.
(a) Find the quasi-magnetostatic electric and magnetic fields inside the conductor.
(b) Show by explicit calculation that these fields satisfy the Poynting theorem,
when averaged over one period of the field oscillation.
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