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 σ1, and the region 2a<r<3a has conductivity σ2. (Assume ε1=ε2=εo.) The inner cylinder is held at potential V0 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.
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. :-)