Question
V-I graph for a metallic wire at two different temperatures T1 and T2 is shown in the figure. Which of the two temperatures is the higher and why?
Solution
The slope of the given graph gives us the inverse of resistance. Resistance of a material increases with increasing temperature because the collision between the molecules increases.
In the graph given, T2 has a smaller slope and hence corresponds to higher resistance. Therefore, T2 > T1.
