A small but measurable current of \( 1.2 \times 10^{-10} \mathrm{~A} \) exists in a copper wire ...

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A small but measurable current of \( 1.2 \times 10^{-10} \mathrm{~A} \) exists in a copper wire whose diameter is \( 3.0 \mathrm{~mm} \). The number of charge carriers per unit volume is \( 8.49 \times 10^{28} \mathrm{~m}^{-3} \). Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.
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