Q.
The current $i$ and voltage $V$ graphs for a given metallic wire at two different temperatures $T_{1}$and $T_{2}$ are shown in the figure. It is concluded that
A) $T_{1} > T_{2}$
B) $T_{1} < T_{2}$
C) $T_{1} = T_{2}$
D) $T_{1} = 2T_{1}$
Explanation
(a) Slope of the graph will give us reciprocal of resistance. Here resistance at temperature $T_{1}$is greater than that at $T_{2}$. Since resistance of metallic wire is more at higher temperature then at lower temperature, hence $T_{1} > T_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.