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## Homework Statement

Consider two coaxial conducting cylinders with radii a and 3a and length L. The region a<r<2a is filled with a material of conductivity σ

_{1}, and the region 2a<r<3a has conductivity σ

_{2}. (Assume ε

_{1}=ε

_{2}=ε

_{o}.) The inner cylinder is held at potential V

_{0}and the outer cylinder at V=0, so there is a radial current I.

(a) Determine the resistance.

(b) Determine the surface charge density on the boundary at r=2a.

## Homework Equations

V=IR, R=pL/A, R=V/I=L/σA

## The Attempt at a Solution

How do I do this? This probably is a simple problem, but I am having a hard time visualizing the path to the answer. Please help. :-)