The I-V graph for a given metallic wire at th | vedclass

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(A) For a metallic wire,the slope of the $I-V$ graph represents the conductance,which is the reciprocal of resistance $(R = V/I)$.From the graph,the s

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$1$

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(A) For a metallic wire,the slope of the $I-V$ graph represents the conductance,which is the reciprocal of resistance $(R = V/I)$.From the graph,the slope is given by $\Delta I / \Delta V = 1/R$.As the temperature of a metallic conductor increases,its resistance $(R)$ increases.Since $R$ increases with temperature,the slope $(1/R)$ decreases as the temperature increases.Therefore,the line with the smallest slope corresponds to the highest temperature.In the given graph,line $1$ has the smallest slope,so it represents the highest temperature.

The $I-V$ graph for a given metallic wire at three different temperatures is shown. Which of these represents the highest temperature?

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