Field and Wave Electromagnetics 2nd Edition by David Cheng

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Redo Problem, assuming that the truncated conical block is composed of an inhomogeneous material with a nonuniform conductivity ( R )= 0 R 1 / R, where R 1 R R 2.
Problem:
A homogeneous material of uniform conductivity is shaped like a truncated conical block and defined in spherical coordinates by

Determine the resistance between the R = R 1 and R = R 2 surfaces.