Question: The region between two concentric conducting spheres with radii a and b is filled with a conducting material with resistivity p. (a) Show that the

The region between two concentric conducting spheres with radii a and b is filled with
a conducting material with resistivity p.
(a) Show that the resistance between the spheres is given by

(b) Derive an expression for the current density as a function of radius, in terms of the potential difference Vab between the spheres.
(c) Show that the result in part (a) reduces to Eq. (25.10) when the separation L = b - a between the spheres is small.

R. 4т(а b)

R. 4( b)

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