Question: Q. 7. Define the term mobility of charge carriers in a conductor. Write its S.I. unit.
R[Delhi I, II, III 2014]
Solution:
Ans. Magnitude of the drift velocity of charge carrier per unit electric field is called mobility.
Alternatively,
$$ \mu=\frac{\left|v_{d}\right|}{E} \text { or } \frac{e \tau}{m} $$
Its SI unit is $\mathrm{m}^{2} /$ (volt second) or $\mathrm{ms}^{-1} \mathrm{~N}^{-1} \mathrm{C} \quad 1 / 2$
[CBSE Marking Scheme 2014]
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