Question: A copper wire ( diameter 1 . 0 2 mm ) carries a current with a current density of 3 . 2 0 1 0

A copper wire (diameter 1.02 mm) carries a current with a current density of 3.20106
A/m2. The density of free electrons for copper is 8.51028 electrons per cubic meter.
Calculate (a) the current in the wire and (b) the drift velocity of electrons in
the wire .

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