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