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The voltage $V$ and current $I$ graphs 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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T_{1} > T_{2}

T_{1} < T_{2}

T_{1} = T_{2}

T_{1} = 1 / T_{2}

answer is A.

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Detailed Solution

The relation between

T_{1}

and

T_{2}

T_{1} > T_{2}

.
The slope of the V-I graph represents a conductor's resistance at a given temperature. According to the graph, the resistance of a conductor at temperature

T_{1}

is greater than at temperature

T_{2}

. We know that a conductor's resistance increases with an increase in temperature and decreases with a decrease in temperature,

T_{1} > T_{2}

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