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Alternating Current — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
Question
Define mobility of a charge carrier. What is its relation with relaxation time?
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Answer

Drift velocity per unit field
$(\mu_{m} = u_{d}\big/\text{E})$
$\mu_{n}\propto\tau$.

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