The electric force between a charged foam cup and a positively charged metal sphere is 2.12 newtons. If the charge on the cup is 2.0 * 10-6 coulombs and the charge on the metal sphere is 2.5 * 10-6 coulombs, what is the distance between the two? (k = 9.0 * 109 newton·meter2/coulombs2.
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