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A small, m = 3.00 g plastic ball is suspended by a L = 24.0 cm...

A small, m = 3.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a 20.0° angle with the vertical as indicated, what is the net charge on the ball?

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