At room temperature,copper has a free electron density of $8.4 \times 10^{28} \, m^{-3}$. 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:
- A$400 \, m/s$
- B$0.4 \, m/s$
- C$0.4 \, mm/s$
- D$72 \, m/s$
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