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A pith ball of mass 0.20 grams and charge -3.0 nC hangs from an insulating thread and is repelled by the charged
metallic sphere of a Van de Graaff generator. It is noted that the thread is tilted by 17 deg when the pith ball hangs at
rest 0.30 m from the center of the sphere. Determine the electric field at that position.

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