(a) Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0 x 10 m2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0 x 10° kg/m2, and its atomic mass is 63.5 u. (b) Compare the drift speed obtained above with, (i) thermal speeds of copper atoms at ordinary temperatures, (ii) speed of propagation of electric field along the conductor which causes the drift motion.
(a) Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0 x 10 m2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0 x 10° kg/m2, and its atomic mass is 63.5 u. (b) Compare the drift speed obtained above with, (i) thermal speeds of copper atoms at ordinary temperatures, (ii) speed of propagation of electric field along the conductor which causes the drift motion.
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Transcribed Image Text:(a) Estimate the average drift speed of conduction
electrons in a copper wire of cross-sectional area 1.0 x 10 m²carrying
a current of 1.5 A. Assume that each copper atom contributes roughly
one conduction electron. The density of copper is 9.0 x 10° kg/m,
and its atomic mass is 63.5 u. (b) Compare the drift speed obtained
above with, (i) thermal speeds of copper atoms at ordinary
temperatures, (ii) speed of propagation of electric field along the
conductor which causes the drift motion.
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