5.18 Two parallel circular plates of radius a are located at z = 0 and z = d. The top plate (z = d) is raised to potential V0; the bottom plate is grounded. Between the plates is a conducting material having radial-dependent conductivity, s(?) = s0?, where s0 is a constant. (a) Find the ?-independent electric field strength, E, between plates. (b) Find the current density, J between plates. (c) Find the total current, I, in the structure. (d) Find the resistance between plates.

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