Consider the two small, equal-mass, charged spheres shown in the figure. The top sphere is suspended from the ceiling by a filament, and has a charge of q = 28.0 nC. The bottom sphere has a charge of 92 = -58.0 nC, and is directly below the top sphere. Assume d = 2.00 cm and m = 7.40 g. 91 92 (a) Calculate the tension (in N) in the filament. N (b) If the filament can withstand a maximum tension of 0.180 N, what is the smallest valued can have before the filament breaks? (Give your answer in cm.) cm