Q. The voltage $V$ and current $I$ graph for a conductor at two different temperatures $T_{1}$ and $T_{2}$ are shown in the figure. The relation between $T_{1}$ and $T_{2}$ is
A) $T_{1} > T_{2}$
B) $T_{1} \approx T_{2}$
C) $T_{1} = T_{2}$
D) $T_{1} < T_{2}$
Explanation
(a) Slope of the $V - i$ curve at any point equals to resistance at that point. From the curve slope for $T_{1} >$ slope for $T_{2} \Rightarrow R_{T_{1}} > T_{T_{2}}.$ Also at higher temperature resistance will be higher so $T_{1} > T_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.