Q. Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated, resistance of $P$ increases and that of $Q$ decreases. We conclude that
A) $P$ and $Q$ are conductors of different materials
B) $P$ is $N$-type semiconductor and $Q$ is $P$-type semiconductor
C) $P$ is semiconductor and $Q$ is conductor
D) $P$ is conductor and $Q$ is semiconductor
Explanation
(d) Conductor has positive temperature coefficient of resistance but semiconductor has negative temperature coefficient of resistance
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.