In Fig. 21-39, two tiny conducting balls of identical mass m and identical charge q hang

Chapter 21, Problem 42

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In Fig. 21-39, two tiny conducting balls of identical mass m and identical charge q hang from nonconducting threads of length L.Assume that u is so small that tan u can be replaced by its approximate equal, sin u. (a) Show that x q2L2p0mg 1/3W, gives the equilibrium separation x of the balls. (b) If L 120 cm, m 10 g, and x 5.0 cm, what is |q|? L Lq qxFigure 21-39 42 and 43.

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