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Ok, when r is less than Rsub 1, the electric field is zero. And when r is greater than Rsub2, it is easy to calculate using Gauss's Law. Now, when r is between Rsub1 and Rsub2....what is the excess charge inside the Gaussian cylinder? I know that any net charge in a conductor must be on one of the surfaces. But on which one, and how much on each?

This might be a silly guess, but maybe Q/2 ?