Magnetic Field of a rotating Cylinder

[Aavatar]

Homework Statement

.[/B]
Given an infinitely long charged metal cylinder that is rotating with an angular velocity $\omega$ The charge density per unit length is $\rho$. Find the magnetic field within the cylinder.

I'm trying to solve this problem by using Ampere's Law. But couldn't reach anywhere, if anyone could give me some hints, that would be great.
Thanks.

 

[BvU]

Hello AA, welcome to PF !

Well, you have a relevant equation then: Ampere's law. How does it read ?
Fill that in under 2. in the template and show us how far you can get under 3.: attempt at solution.

PF requires an effort and the template is mandatory. For good reasons. read the guidelines to find out why.