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A wire of diameter $0.02\,meter$ contains $10^{28}$ free electrons per cubic meter. For an electrical current of $100\, A$, the drift velocity of the free electrons in the wire is nearly
  • A$1 \times 10^{-19} \,m/s$
  • B$5 \times 10^{-10} \,m/s$
  • C$2 \times 10^{-4} \,m/s$
  • D$8 \times 10^{3} \,m/s$
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