In Fig. 21-39, two tiny conducting balls of identical mass
Chapter , Problem 42(choose chapter or problem)
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 thatx ! # q2 L 2p0mg $ 1/3 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 L q q x Figure 21-39 42 and 43
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