Q2 of 26 Page 1

V – I graph for a metallic wire at two different temperatures T1 and T2 is as shown in the figure. Which of the two temperatures is higher and why?

1.PNG


Let us consider a fixed value of voltage for which the wire has two different currents I1 and I2 at temperature T1 and T2. We know that,


The heat in the wire = (current)2×Resistance×Time for which current flows.


We can see that I2 > I1⇒ T2 > T1


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