Q. Assume that each atom of copper contributes one free electron. What is the average drift velocity of conduction electrons in a copper wire of cross-sectional area , carrying a current of ? (given, density of copper ; atomic mass of copper ; Avogadro's number per gram atom)

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Solution:

Here, density of copper ,
Avogadro's number .
Atomic mass of copper
Number of free electrons per unit volume,

Drift velocity i.e.,