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A current 4.0 A exist in a wire of cross...

A current 4.0 A exist in a wire of cross-sectional area `2.0 mm^(2)`. If each cubic metre of the wire contains `12.0xx10^(28)` free electrons, then the drift spped is

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The current density in the wire is
`k=i/A=(2.0A)/(1 mm^(2))=2.0xx10^(6)Am^(-2)`.
The drift speed is
`v=j/ne=(2.0xx10^(6) Am^(-2))/(6.0xx10^(28)m^(-3)xx1.6xx10^(-19)C)`
`=2.1xx10^(-4)m s^(-1)`.
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