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Question

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0×107 m2carrying a current of 1.5A. Assume the density of conduction electrons to be 9×1028m3.

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Solution

Since, drift velocity, vd=InAq

where,

I is the current,

n is the charge density,

q is charge of the electron, and

A is cross-sectional area.

vd=1.59×1028×1.0×107×1.6×1019

vd=10.4×104 m/s

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