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Estimate the Average Drift Speed of Conduction Electrons in a Copper Wire - Physics

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Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0 × 10−7 m2 carrying a current of 1.5 A. Assume the density of conduction electrons to be 9 × 1028 m−3

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Solution

We know that drift velocity, 

`V_d=I/(nAq)`

where I is the current, n is charge density, q is charge of electron and A is cross-section area.

`V_d=1.5/(9xx10^28xx1.0xx10^(-7)xx1.6xx10^(-19))`

`V_d=10.4xx10^(-4) "m/s"`

Concept: Drift of Electrons and the Origin of Resistivity
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