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A small but measurable current of 1.2X10^-10 A exists in a copper wire whose diameter is 2. The number of charge carriers per unit volume is...

1.A small but measurable current of 1.2X10^-10 A exists in a copper wire whose diameter is 2.5mm. The number of charge carriers per unit volume is 8.49X10^28 m^-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.

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