ch26-p004 - 4. (a) The magnitude of the current density...

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4. (a) The magnitude of the current density vector is J i A i d == = × × π π 2 10 3 2 5 4 412 10 25 10 24 10 / . . .. A m A/m 2 ch (b) The drift speed of the current-carrying electrons is
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