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## Homework Statement

A coaxial cable consists of a long solid inner cylindrical conductor, radius a, and a thin outer cylindrical conductor of average radius b>a. Suppose the inner conductor has a line charge density of +lambda while the outer conductor has a uniformly distributed charge of -lambda. Find the electric field (as a function of r) in a) inside the inner conductor, b) between conductors and c) the outside cable

## Homework Equations

E=q/Epsilon0 E=q/(4piEpsilonr^2)

## The Attempt at a Solution

I would imagine using Gaussian cylindrical symmetry could help find the field for the inside and outside cable. However, I cannot figure out how to find the field between the conductors. A full explanation of this problem would be so greatly appreciated, as I am struggling to grasp the effect of oppositely charged conductors in electric fields. Thanks.