$A$ copper wire has a square cross-section,$2.0 \, mm$ on a side. It carries a current of $8 \, A$ and the density of free electrons is $8 \times 10^{28} \, m^{-3}$. The drift speed of electrons is equal to
- A$0.156 \times 10^{-3} \, m/s$
- B$0.156 \times 10^{-2} \, m/s$
- C$3.12 \times 10^{-3} \, m/s$
- D$3.12 \times 10^{-2} \, m/s$
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