**1. The problem statement, all variables and given/known data**

A uniform linear charge of λ is located along the z axis, and concentric circular cylinder of radius 2 [m] has a surface distribution charge of α . both distributions are infinite, the distribution of linear charge is contained in the interior of the circular cylinder as shown image.

λ = 3 * 10^-3 (C/M)

σ = 1.54pi * 10^-3 (C/M^2)

Determine E, in all regions

**2. Relevant equations**

**3. The attempt at a solution**

so i was wondering if these are the formulas that i have to use in order to solve this problem

http://ift.tt/1h9FXsk