Two small plastic balls hang from threads of negligible mass.eachball has a mass

Question

Two small plastic balls hang from threads of negligible mass.eachball has a mass of 0.12g and a charge of magnitude q. the balls areattracted to each other, and threads attached to the balls make anangle of 15 degree with the vertical.Fine: i) the magnitude of the electric force acting on eachball. ii) the tension in each of the threads. iii) the magnitude of the charge on the balls. i) the magnitude of the electric force acting on eachball. ii) the tension in each of the threads. iii) the magnitude of the charge on the balls.

Explanation / Answer

a) Since the tension of the tring is along its direction. So Fe/mg=tan15 Fe=mgtan15=3,15*10^-4(N) b) Let the tension be T Fe/T=sin15 so T=Fe/sin15=1,22*10^-3(N) c) The magnitude of the charge is depend on the distance betweentwo balls. So in this question I can only conclude that the two charges areone positive and one negative

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