The density of mobile electrons in copper metal is 8.4 1028 m-3. Suppose that i = 4.2 1018 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 0.6 mm. In this case, about how many minutes would it take for a single electron in the electron sea to drift from one end to the other end of a wire 34 cm long?
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