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Solve 8. Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will

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8. Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract ball A. Which of the statements can be correctly concluded about the charge on the balls? (A) Ball A has a positive charge (B) Ball B has a negative charge (C) Ball A and Ball B must have opposite charges (D) Ball A is neutral B

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