#### Question

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 2.5 × 10^{−7} m^{2} carrying a current of 1.8 A. Assume the density of conduction electrons to be 9 × 10^{28} m^{−3}.

#### Solution

We know that drift velocity, `V_d=1/(nAq)`

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

`:.V_d=1.8/(9xx10^28xx2.5xx10^(-7)xx1.6xx10^(-19))`

`V_d=5xx10^(-4) `

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Solution Estimate the Average Drift Speed of Conduction Electrons in a Copper Wire Concept: Drift of Electrons and the Origin of Resistivity.