Electric field in all regions of infinite cylinder

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

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