Q. A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it
A) increases, thermal velocity of the electron decreases
B) Decreases, thermal velocity of the electron decreases
C) increases, thermal velocity of the electron increases
D) Decreases, thermal velocity of the electron increases
Explanation
(a) With rise in temperature the thermal velocity of the electron increases. Relaxation time and hence drift velocity will decrease.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.