The V-I graph of a metallic wire at two temperatures T _{1} and T _{2 where slope of T } _{ 2 is greater than slope of T1 }

Which of the twotemperatures is higher and why?

We know that for conductors the resistance increases with temperature.

Now, the slope of a typical V-I graph for a conductor represents the resistance or

R = V/I = slope

now, as the slope of metal 2 is greater than metal 1 then the resistance of metal 2 will also be grater than metal. This would mean that temperature (which is directly related to resistance) will be greater for metal 2 compared to metal 1.

**
**