Question

The current voltage graphs for a given metalic wire two different temperature `T_1` and `T_2` are shown in figure The temperature `T_2` is greater than `T_1.` Is this statement true or false?

Answer 1

`I/V="Slope of given graph" =1/R`
or `R=1/"Slope" rArr ("slope")_(T_2) lt("slope")_(T_1) rarr 1/(("Slope")_(T_2))gt1/(("Slope"))_(T_1)`
Resistant of as metallic wire increases with increase in temperature.
or `R_(T_2)gtR_(T_1)or T_2gtT_1`
Therefore the statement is true.