There is a current of 40 ampere in a wir...

There is a current of 40 ampere in a wire of `10^(-6)m^(2)` are of cross-section. If the number of free electron per `m^(3)` is `10^(29)` then the drift velocity will be

`1.25xx10^(3) m//s`

`2.50xx 10^(-3)m//s`

`25.0xx10^(-3)m//s`

`250xx10^(-3)m//s`

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