equipotentials for two point charges (a) two point charges q are located at (±r,0,0).find the electric field at all points on the z-axis. for what value of z is the field maximum? (b) make a rough sketch of the equipotential curves everywhere in space (or rather, everywhere in the xz plane). be sure to indicate what the curves look like very close to and very far from the charges, and how the transition from close to far occurs.