Q. A strip of copper and another of germanium are cooled from room temperature to $80\ K.$ The resistance of
A) Each of these increases
B) Each of these decreases
C) Copper strip increases and that of germanium decreases
D) Copper strip decreases and that of germanium increases
Explanation
(d) For conductors, resistance $\propto$ Temperature and for semiconductor, resistance $\propto \frac{1}{Temperature}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.