Lightning strikes a lossy dielectric sphere−ϵ = 1.2ϵ0, σ = 10(S/m)— of radius 0.1 (m) at time t = 0, depositing uniformly in the sphere a total charge 1 (mC). Determine, for all t,
a) the electric field intensity both inside and outside the sphere,
b) the current density in the sphere.
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