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Question: charge 1 of 250 microcoulombs and charge 2 are separated...

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Charge 1 of 25.0 micro-coulombs and charge 2 are separated by some distance and the magnitude of the electric force between them is 20 N. Charge 1 is then changed, but the distance between the charges is the same. The force between them now is 5 N. What is the magnitude of the first charge now in micro-coulombs?

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