Three 3.0 g balls are tied to 80-cm-long threads and hung
Chapter 22, Problem 22.110(choose chapter or problem)
Three 3.0 g balls are tied to 80-cm-long threads and hung from a single fixed point. Each of the balls is given the same charge q. At equilibrium, the three balls form an equilateral triangle in a horizontal plane with 20 cm sides. What is q?
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