Q. A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is some how decreased in the resistor (for example by cooling it), the current will
A) Remains constant
B) Increase
C) Decrease
D) Become zero
Explanation
(b) If number of collisions of the free electrons with the lattice is decreased, the time of relaxation of electrons will increase. Due to which drift velocity of electrons will increase and hence current will increase
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.