In Figure two tiny conducting balls of identical mass m and identical charge q hang from non-conducting threads of length L. Assume that θ is so small that tan θ can be replaced by its approximate equal, sin θ.

(a) Show that x = (q2L/2πε0mg) 1/3 gives the equilibrium separation r of the balls.

(b) If L = 120cm, m = 10 g, and x = 5.0 cm, what is |q|?

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