A current of 10 A exists in a wire of cross sectional 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 _________.
 
Option: 1 1 \times 10^{23}
Option: 2 625 \times 10^{25}
Option: 3 2 \times 10^{25}  
Option: 4 2 \times 10^{6}

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