Solved: In Fig. 21-38, two tiny conducting balls of

Chapter , Problem 42

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In Fig. 21-38, two tiny conducting balls of identical mass m and identical charge q hang from nonconducting threads of length L. Assume that (J is so small that tan (J can be replaced by its approximate equal, sin (J. (a) Show that ( qZL )113 x = 21T1>omg gives the equilibrium separation x of the balls. (b) If L = 120 cm, m = 10 g, and x = 5.0 cm, what is Iql?

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