Charge q1 = 8.5 nC is located at the coordinate system origin, while charge q2 = 3.7 nC is located at (a, 0), where a = 1.4 m. The point P has coordinates (a, b), where b = 0.85 m. A third charge q3 = 15 nC will be placed later.
Part (a) At the point P, find the electric potential V, in units of Volts.
Part (b) In Joules, how much work W would you have to do to bring the third charge, q3, from very far away to the point P?
Part (c) In Joules, what is the total potential energy U of the final configuration of three charges?