2. Two equally charged balls, each of mass 0.10 gm, are suspended from the same point by threads 13 cm long. The balls come to rest 10 cm apart due to electrostatic repulsion. Determine the charge on each ball.

Answer 1

well, the angle on each string is arcsin5/13
lets call that angle theta.

so tanTheta=kqq/(.1^2*mg)

so figure q