Calculating Flux for Hemispheres of Different Radii 1. The problem statement, all variables and given/known data Calculating Flux for Hemispheres of Different Radii. There are two hemispheres and I have to find the flux through the annular ring of surface 1, 2, and 3 in terms of C (a constant proportional to a charge) and two radii r_1 and r_2. Here is a diagram of this http://img233.imageshack.us/img233/5523/hemsp1tw8.gif [Broken] 2. Relevant equations flux = |E||dA|cos(theta) E(r)=C/r^2 r_hat These are the equations that are given in the problem. 3. The attempt at a solution I really have know idea where to go with this problem. I know it just has to be the equation, but I don't know how to set it. If anyone has any strategies to solving this problem that would be great. Thanks.