V- I graph for a metallic wire at two different temperature `T_(1)` and `T_(2)` is shown in figure. Which of the two temperature is higher and why?
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We know that resistance, `R=V/l` From figure, for given V, `I_(1) gt I_(2)` , therefore, `R_(1) ltR_(2)`. As `R prop T_(1)` so `T_(1) lt T_(2)` i.e., `T_(2)` is greater than `T_(1)` .
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