Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 2·5 × 10−7 m2 carrying a current of 2·7 A. Assume the density of conduction electrons to be 9 × 1028 m−3
We know that drift velocity,
where I is the current, n is charge density, q is charge of electron and A is cross-section area.
This is the required average drift velocity.
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