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
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Slope of the $V-i$ curve at any point equal to resistance at that point. From the curve slope for $T_1$ > slope for $T_2$
$ \Rightarrow $ ${R_{{T_1}}} > {R_{{T_2}}}$. Also at higher temperature resistance will be higher so $T_1 > T_2$
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