A system of three charged point particles is held in place by a rigid rod. This system is then placed in a constant external electric field. D d 2d -Q B E d +2Q What is the dipole contribution to the electric potential energy (in pJ) of the interaction between this system and the external electric field if Q = 4 nc, E = 5 N/C, d = 0.02 m, and d = 30