Part A Two point charges are placed on the z axis as follows: Charge q = +4.05 nC is located at x=0.200 m and charge q2=-5.40 nC is at x = +0.400 m. What is the magnitude of the net force exerted by these two charges on a third point charge 93 = -0.610 nC placed at the origin? Express your answer in newtons. ? Fnet= N