A point charge q2 = -2.3 µC is fixed at the origin of a co-ordinate system as shown. Another point charge q1 = 4.0 µC is is initially located at point P, a distance d1 = 6.0 cm from the origin along the x-axis
The charge q2 is now replaced by two charges q3 and q4 which each have a magnitude of -1.15 µC, half of that of q2. The charges are located a distance a = 1.4 cm from the oringin along the y-axis as shown. What is ?PE, the change in potential energy now if charge q1 is moved from point P to point R?