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I-V graph for a metallic wire at two dif...

I-V graph for a metallic wire at two different temperatures T1 & T2 as shown in figure. Which of the two temperature is lower. Why ?

Text Solution

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For the same potential V0
Resistor at `T_(1),R_(1)=(V_(0))/(I_(1))`
Resistor at `T_(2),R_(2)=(V_(0))/(I_(2))`
`I_(1) gt I_(2)` (from the graph) `" " :. R_(1)lt R_(2)`
Since resistor of a metal increases with temperature
`:. T_(1) lt T_(2)`
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