In a metal conductor 0.1 A current is fo...

In a metal conductor 0.1 A current is following. The cross sectional area is `5 mm^2`. Drift velocity is given to be `2 xx 10^-3` m/s. Find free electron density

`625 xx 10^23`

`62.5 xx 10^23`

`500 xx 10^23`

`400 xx 10^23`

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