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ELECTRICITY UNIT TEST 3. Consider the following interactions between the various combinations of four charged pith balls, A, B. C and D. B repels A.

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ELECTRICITY UNIT TEST 3. Consider the following interactions between the various combinations of four charged pith balls, A, B. C and D. B repels A. D attracts C and A. If D is attracted to an acetate strip that has been rubbed with silk, what are the charges on A, B, C and D. Justify your answer [ 5 marks] Acetate Glass Wool Fur Ca, Mg, Pb Silk Al, Zn Cotton Ebonite Plastic Ca, Cu, Ni

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