1. The problem statement, all variables and given/known data Two point charges q and -q are located on the z axis at (x,y,z) = (0,0,a) and (0,0,-a) respectively. Find the potential [tex]\phi[/tex] everwhere 3. The attempt at a solution I know all the equations and such, I just don't know how to integrate it. I am guessing that it is in cylindrical coordinates.