1. The problem statement, all variables and given/known data http://img244.imageshack.us/my.php?image=a1physicsmt8.png 2. Relevant equations Gauss' Law 3. The attempt at a solution It may be that I'm sick with a cold and can't think straight, but I"m not seeing any way to approach this problem using Gauss' law. I tried using a few prederived formulas, but like for the first part of this 5 part problem, I need the charge/length in order to find out E. I don't have that value, and I did try using rho as lambda, and got it wrong. I also have to find the charge at values inbetween the cylinder and the shell, outside the shell, and on the inner shell. Some help would be nice, as I can't see how to do this by hand right now.