What do you mean by drift velocity and mobility ? - Vidyadip

Question

What do you mean by drift velocity and mobility ?

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Answer

Drift Velocity : It is defined as the small constant velocity with which free electrons get drifted towards the positive end of the conductor under the influence of the electric field developed within the conductor by applying potential difference across the ends of the conductor. It is of the order of $ 10^{-4} m/s $.
Mobility : Mobility of a charge carrier is defined as the drift velocity per unit electric field strength i.e.,
$ \mu = v_d / E $.
Its S.I. unit is $ m^2/Vs $.

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