(32. A small sphere of charge % = 0.800 C hangs from the end of a spring as in Fig- ure P22.32a. When another small sphere of charge q = -0.600 C is held beneath the first sphere as in Figure P22.32b, the spring stretches by d = 3.50 cm from its orig- inal length and reaches a new equilibrium position with a separation between the charges of r = 5.00 cm. What is the force constant of the spring? k k 91 0800C 91 a Figure P22.31 a = 3.50cm r = 5.00cm 92 -0,600 MC b