1. The problem statement, all variables and given/known data Two point charges q1 and q2 are located on a straight line normal to a grounded (V=0) conducting plane. Choosing the z axis to go through the charges, q1 is at a distance z1 above the conductor, and q2 is at a distance z2. Find the potential V(x,y,z) everywhere above the conductor. 2. Relevant equations 3. The attempt at a solution I know the formula for the potential of 1 point charge in open space. I can also use image charges to define the potential at a point V(x,y,z > 0). But for two charges, would the potential at any point be the sum of the individual potentials?