1. The problem statement, all variables and given/known data http://photos-e.ak.fbcdn.net/hphotos-ak-snc1/hs031.snc1/2658_1060058793594_1589658877_146788_3259033_n.jpg [Broken] 2. Relevant equations 3. The attempt at a solution So I know that I should use the superposition principle, and treat it as 2 superimposed spheres of opposite charge densities. I can use Gauss's law to find the electric field of each. However I am having a little trouble figuring out how to take into account the fact that the spheres are not concentric. I also don't know whether to use the electric field inside or outside the spheres.