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  4. The voltage V and current. I graphs for a conductor at two different temperatures T1 and T2 are shown in the figure. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/688b1dc22041a69dd6fe794b5b9bb27f-.jpeg /> The relation between T1 and T2 is

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Q. The voltage $V$ and current. $I$ graphs for a conductor at two different temperatures $T_1$ and $T_2$ are shown in the figure.
image
The relation between $T_1$ and $T_2$ is

Current Electricity

Solution:

The slope of $V$-$I$ graph gives the resistance of a conductor at a given temperature.
image
From the graph, it follows that resistance of a conductor at temperature $T_1$ is greater than at temperature $T_2$. As the resistance of a conductor is more at higher temperature and less at lower temperature, hence $T_1 > T_2$.