1. The problem statement, all variables and given/known data A 32 cm diameter conducting sphere is charged to 500 V relative to V=0 and r = infinity. (a) What is the surface charge density sigma? (b) At what distance will the potential due to the sphere be only 10 V? 2. Relevant equations 3. The attempt at a solution I know that to find the surface charge density I have to find charge/area. (Sigma = q/A) Finding the area just means finding the surface area of the sphere right? 4(pi)((0.16m)^2) Is the charge 500 V? It seems like charge should be expressed in coulombs. I'm not really sure how to get the charge of the sphere. Then to find the distance at which the potential is only 10 V Do I use V= (1/4(pi)(eo)* sigma/r? where r is that distance and V = 10V?