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Cross-sectional area of a Copper wire is...

Cross-sectional area of a Copper wire is equal to area of a square of length 2 mm. If this copper wire draws 8 A electric current, then find the drift velocity of free electron. Number density of electron in Copper wire is ` 8 xx 10^(28) m^(-3)`

A

`1.56 xx 10^(-4) ms^(-1)`

B

`1.56 xx 10^(-2) ms^(-1)`

C

`3.12 xx 10^(-3) ms^(-1)`

D

`3.12 xx 10^(-2) ms^(-1)`

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