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A current of $10\, A$ exists in a wire of crosssectional area of $5\, mm ^{2}$ with a drift velocity of $2 \times 10^{-3}\, ms ^{-1}$. The number of free electrons in each cubic meter of the wire is ..........
  • A$2 \times 10^{6}$
  • B$625 \times 10^{25}$
  • C$2 \times 10^{25}$
  • D$1 \times 10^{23}$
JEE MAIN 2021, Medium
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