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Estimate the average drift speed of cond...

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area `2.0 xx 10^(-7)m^(2)` carrying a current of 3.0 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is` 9.0 xx10^(3) kg//m^(3)`, and its atomic mass is 63.5 u.

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The correct Answer is:
`(1.5xx63.5xx10^(-3))/(1.6xx6xx9)=1.1xx10^(-3)ms^(-1)`
or `1.1 mm s^(-1)`
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(a) Estimate the average drift speed of conductin electrons in a copper wire of cross sectional area 1.0xx10^(-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 9.0xx10^3 kgm^(-3) and its atomic mass is 63.5 u. (b) Compare the drift speed obtained with the speed of propagation of electric field along the conductor, which causes the drift motion.

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