Question: A small but measurable current of 1.2 x 10-10 A exists in a copper wire whose diameter is 2.5 mm. The number of charge carriers

A small but measurable current of 1.2 x 10-10 A exists in a copper wire whose diameter is 2.5 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 drifts speed.

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