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## Homework Statement

A non-conducting, infinitely long, cylindrical sheath has inner radius r=10 m, outer radius r=15 m and a uniform charge density of 9 nC/m^3 spread throughout the sheath. Magnitude of electric field at r=5, r=12, r=17?

## Homework Equations

Q=rho(Volume) and phi=EA therefore phi=E(2pi(R)length)

phi=Q/epsilon_0

## The Attempt at a Solution

At r=5, Electric field=0

At r=12, phi=Q/epsilon_0, so E(2pi(R)length)=Q/epsilon_0

I just don't know what Q will be.

The same for r=17, I don't know how to find Q.