Question
What is mobility? Write its expression also.
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Answer
For any conductor, ratio of drift velocity and electric field inside the conductor remains constant at the given temperature. This constant quantity is known as mobility $(\mu)$ of charge carrier (electron)
$ \text { mobility }(\mu)=\frac{\text { drift velocity }}{\text { electric field }}=\frac{e \tau}{m} $
$ \text { mobility }(\mu)=\frac{\text { drift velocity }}{\text { electric field }}=\frac{e \tau}{m} $
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