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## Homework Statement

I have attached the problem

## Homework Equations

E*A = Qenc/ E0

## The Attempt at a Solution

At the moment I am looking at the problem more conceptually and seeing what is happening at each point and I wanted to know If I was on the right track.

r<a

As all charge would reside on the outside of the inner conductor there would be no electric field

a<r<R

The electric field would be q/(2pi*r*E1*E0)

R<r<b

The electric field would be q/(2pi*r*E2*E0)

b<r<c

This is the part that has me puzzled , I thought the inner conductor charge(q) and outer conductor charge (-q) would cancel each other , so there would be no field present? Is this part mean to represent the outer rubber shielding of a coaxial cable?

c<r

Would the electric field also be zero outside of the cable due to the two charges cancelling?

Thanks