A small but measurable current of 84 x 10-10 a exists in a, Ask an Expert

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A small but measurable current of 8.4 x 10-10 A exists in a copper wire whose diameter is 2.9 mm. The number of charge carriers per unit volume is 8.49 x 1028 m-3. Assuming the current is uniform, calculate the

(a) current density and

(b) electron drift speed.

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