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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
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 ? Express your answer to two significant figures and include the appropriate units.
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