A charge is placed at the origin, another charge -2Q is placed at (x=6m, y=0) and a third charge 4Q is placed at (x=0, y=8).
A) What is the electric potential energy of the system? Your answer should be in terms of k and Q.
B) How much work is needed to move the charge Q very far away from the other two charges? Your answer should be in terms of k and Q.