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Question

I-V graph for a mettallic wire at two different temperatures, T1 and T2 is as shown in the figure.

Which of the two temperature is lower and why?


Solution

The slope of a V-I graph is given by the formula IV=1R.  Thus, the smaller the slope larger is the resistance. As the resistance of a metal increases with the increase in temperature, so resistance at T2 is higher and lower at T1.
Therefore temperature T2 is lower.

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