Two identical pith balls are charged by rubbing against each other.They are suspended from a horizontal rod through two strings of length 20 cm each,the separation between the suspension points being 5 cm.In equilibrium , the separation between the balls is 3 cm.Find the mass of each ball and the tension in the string.The charge on each ball has a magnitude of 2.0 x 10-8 C.
the other is -q {bcoz charges are produced by rubbing}
three forces are acting on the ball
electrostatic force of attraction,tension and the weight
use lami's theorem to get the solution
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