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Q.

Mobility of free electrons in a conductor is

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a

inversely proportional to electron density

b

inversely proportional to relaxation time

c

directly proportional to electron density

d

directly proportional to relaxation time

answer is B.

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Detailed Solution

The mobility is given as $μ = \frac{q τ}{m}$ .

Here mobility is directly proportional to the relaxation time.

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