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Calculate the drift velocity of electrons in a copper wire with a diameter of 2.053 mm (12-gauge) carrying a
20.0-A current, given that there is one free electron per copper atom. (Household wiring often contains 12-
gauge copper wire, and the maximum current allowed in such wire is usually 20.0 A.) The density of
copper is 8.80 × 10³ kg/m³ and the atomic mass of copper is 63.54 g/mol.

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