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## Homework Statement

Consider a long, cylindrical charge distribution of radius R with uniform charge density ρ.

a) Using Gauss’s law, find the electric field at distance r from the axis, where r < R

b) Using Gauss’s law, find the electric field at distance r from the axis, where r > R

## Homework Equations

∫EdA = Qinside/ε

_{0}

q = ρV

V = πr

^{2}L

A = 2πrL

## The Attempt at a Solution

I've successfully solved the first part which is E = ρr/2ε

_{0}.

However for the second part I am confused as to whether or not I would need to use big R for the area, because we are now going at a distance out of the surface or to use little r.