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physics 2

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Two identical positive charges are placed 15 cm apart and the magnitude of the electric force between them is 5.4 Newtons. They then exchange charge (one charge loses some electrons and the other gains the same amount of electrons), but they both still remain positive. After they have exchanged charge and are placed 15 cm apart the magnitude of the electric force is now 3.8 Newtons. How much charge, in micro-coulombs, was exchanged? Use the absolute value of the charge exchanged so the answer is positive.

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