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Estimate the average drift velocity of c...

Estimate the average drift velocity of conduction electron of a copper wire of cross section `2.0 times 10^-3 cm^2` carrying a current of 2.0A.Assume the density of conduction electrons to be `9 times 10^28 m^-3`.

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`v_d=1/(n eA)=2.0/((9times10^28)times(1.6times10^-19)times(2.0times10^-7))[becausee=1.6times10^-19C]`
`=6.94 times 10^-4 m.s^-1` approx
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