Four point-like charges are placed as shown in the figure, three of them are at the corners and one at the center of a square, 24.0 cm on each side. What is the electric potential energy of the entire system of charges? Let q1 = +13.0 μC, q2 = −32.0 μC, q3 = +24.0 μC, and q4 = −47.0 μC. J