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Three 10.53-g Styrofoam balls of radius 2 cm are coated with carbon black to make them conducting and then are tied to 1.21-m-long threads and suspended freely from a common point. Each ball is given the same charge, q. At equilibrium, the balls form an equilateral triangle with sides of length 24.56 cm in the horizontal plane. Determine the absolute value of q.

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