1. The problem statement, all variables and given/known data I'm currently tackling parts (a) and (b) of section ii) decribed here:http://puu.sh/31KIZ.png [Broken] 2. Relevant equations V=(q/4∏ε)*(1/r) 3. The attempt at a solution From the first section (i) calculating the potential was relatively straight forward since we were only considering a plane. In part (a) however it just asks me for the potential outside the sphere, and I'm unsure how to calculate this since I can't seem to figure out how to determine the potential at any single point due to either charge (especially since I can't work out the distance between them). Though section (b) also seems puzzling to me, I'm guessing that solving part (a) will aid me in figuring it out.