Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0 × 10 – 7 m 2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0 × 10 3 kg m – 3 and its atomic mass is 63.5 amu.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
( 
= 1.1 × 10 – 3 ms – 1 or 1.1 mm s – 1)
Sol. Mass of copper per unit volume = 9 × 10 3 kg
Atoms of Cu per unit volume = 
= n
i = neAV d .
V d = 
= 1.1 0 × 10 – 3 ms – 1 .
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