1. The problem statement, all variables and given/known data We have a solid cylinder of radius R0, and it has a uniform charge density p. The length is much greater than its radius, so it appears almost infinite. 2. Relevant equations Find the electric field inside the cylinder where r<R0 and outside the cylinder where r>R0 3. The attempt at a solution I know that you need to use Gauss's law on this and I believe that for inside the cylinder it will be E= p/(pi*r^2*ε0) Will it be the same for outside the insulator?