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Two small metallic spheres, each of mass m = 0.45 g, are suspended as pendulums by light strings from a common point. The spheres are given the same electric charge, and it is found that they come to equilibrium when each string is at an angle of ? = 7.0° with the vertical. If each string has length L = 26.0 cm, what is the magnitude of the charge on each sphere?

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