JEE PHYSICS MCQ: CURRENT ELECTRICITY

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The mobility of free electrons (charge

=\mathrm{e}

, mass

=\mathrm{m}

and relaxation time

=\tau

) in a metal is proportional to

View answer and explanation

Correct option: A

\frac{\mathrm{e}}{\mathrm{m}} \tau

The correct answer is A (

\frac{\mathrm{e}}{\mathrm{m}} \tau

) because mobility is defined as drift velocity per unit electric field, which is proportional to charge and relaxation time, and inversely proportional to mass.

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