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  4. The SI unit of electron mobility is

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Q. The SI unit of electron mobility is

Physical World, Units and Measurements

Solution:

Mobility $\left(\mu_{e}\right) =\frac{\text { Drift velocity }\left(v_{d}\right)}{\text { Electric field }(E)}$
$=\frac{ m s ^{-1}}{ V m ^{-1}}= m ^{2} V ^{-1} s ^{-1}$
The $SI$ unit of electron mobility is $m ^{2} V ^{-1} s ^{-1}$.