At room temperature, copper has free electron density of $8.4 \times {10^{28}}$ per ${m^3}$. The copper conductor has a cross-section of $10^{-6} \,m^2$ and carries a current of $5.4\, A$. The electron drift velocity in copper is
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(c) ${V_d} = \frac{i}{{nAe}} = \frac{{5.4}}{{8.4 \times {{10}^{28}} \times {{10}^{ - 6}} \times 1.6 \times {{10}^{ - 19}}}}$
$= $ $0.4 \times {10^{ - 3}}m/sec = 0.4\,mm/sec$.
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