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Question: Answered & Verified by Expert
Mobility of free electrons in a conductor is
PhysicsCurrent ElectricityKCETKCET 2016
Options:
  • A directly proportional to electron density.
  • B directly proportional to relaxation time.
  • C inversely proportional to electron density.
  • D inversely proportional to relaxation time,
Solution:
2639 Upvotes Verified Answer
The correct answer is: directly proportional to relaxation time.
Mobility of free electrons is given as
$\mu=\frac{q \tau}{m}$
$\Rightarrow \mu \propto \tau(\because q$ and $m$ are constants )
Thus, mobility of free electron in a conductor is directly proportional to relaxation time.

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