There is a current of $40 \ A$ in a wire of cross-sectional area $10^{-6} \ m^2$. If the number of free electrons per $m^3$ is $10^{29}$,then the drift velocity will be:
- A$1.25 \times 10^3 \ m/s$
- B$2.50 \times 10^{-3} \ m/s$
- C$25.0 \times 10^{-3} \ m/s$
- D$250 \times 10^{-3} \ m/s$
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