Question
Physics Question on Electric Current
The mobility of charge carriers increases with
A
increase in the average collision time
B
increase in the electric field
C
increase in the mass of the charge carriers
D
decrease in the charge of the mobile carriers
Answer
increase in the average collision time
Explanation
Solution
The mobility of charge carriers increases with an increase in the average collision time.
- The mobility of charge carriers in a current-carrying conductoris the net average velocity with which free electronsmove towards the positive end of a conductor under the influence of an externally applied electric field.
- If q is the charge of the carrier, τ is the relaxation time, and m is the mass of the charge carrier, then mobility μ = mqτ.
Therefore, the correct answer is option a, increase in the average collision time.