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Aconductor wire having 10^29 free el ect...

Aconductor wire having `10^29` free `el ectrons//m` a current of 20A. If the cross-section of the `1 mm^2`, then the drift velocity of electrons will be

A

`6.25 xx 10^-3 ms^-1`

B

`1.25 xx 10^-5 ms^-1`

C

`1.25 xx 10^-3 ms^-1`

D

`1.25 xx 10^-4 ms^-1`.

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