Three point charges are placed at the corners of a rectangle, as shown in the figure.
q3 = +5 ̆̂̀C
q1 = -4 ̆̂̀C
12 cm
15 cm
q2 = +3 ̆̂̀C
A
A. Determine the potential at point A, taking V = 0 at a great distance.
B. Determine the change in electric potential energy when a fourth point charge, q4 = -2 ̆̂̀C, is brought to point A from infinitely far away. Assume that the three point charges remain fixed in position.
HINT: TWO METHODS CAN BE USED TO DETERMINE THE CHANGE IN ELECTRIC POTENTIAL ENERGY