Q. In the above question if potential difference is applied, the drift velocity at temperature $T$ is
A) Inversely proportional to $T$
B) Proportional to $\sqrt{T}$
C) Zero
D) Finite but independent of $T$
Explanation
(a) When temperature is raised, the ions/atoms of the conductor start vibrating with increased amplitude of vibration and greater frequency. Due to which the electrons moving towards the positive end of conductor will suffermore rapid collisions and hence time of relaxation $(\tau)$decreaseds. As $v_{d} \propto \tau,\ $thus drift velocity decrease. Therefore$\ \ v_{d} \propto 1/T$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.