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

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 2·5 × 10−7 m2 carrying a current of 2·7 A. Assume the density of conduction electrons to be 9 × 1028 m−3

#### 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=2.7/(9xx10^28xx2.5xx10^(-7)xx1.6xx10^(-19)

V_d=7.5xx10^(-4)

This is the required average drift velocity.

Concept: Drift of Electrons and the Origin of Resistivity
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