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Class 12 › Physics › Current Electricity
CBSE2021Class Class 12 · Physics2 Marks · Short✅ Verified
Define mobility of a charge carrier. What is its relation with relaxation time?
✅ Answer & Solution
Mobility $\mu$ = magnitude of drift velocity per unit electric field:
$$\mu = \frac{|v_d|}{E} = \frac{e\tau}{m}$$
where $e$ = charge of carrier, $\tau$ = relaxation time, $m$ = mass of carrier.
SI unit: m$^2$V$^{-1}$s$^{-1}$
