A copper wire of radius 30 mm carries a constant current of, Physics

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A copper wire of radius 30 mm carries a constant current of

A copper wire of radius 3.0 mm carries a constant current of 4 A. Discover the average drift velocity of the electrons if the density of copper is 9000 kg/m3, assuming one conduction electron per copper atom, and recalling that one copper atom has a mass of 64 atomic mass units.

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