question_answer

I and V are respectively the current and voltage in a metal wire of resistance R. Two I-V graphs at two different   temperatures T1 and T2 are given in the graph. Then,

A) \[{{T}_{1}}={{T}_{2}}\]                                  

B)  \[{{T}_{1}}>{{T}_{2}}\]

C) \[{{T}_{1}}<{{T}_{2}}\]                                  

D)  \[{{T}_{1}}=2{{T}_{2}}\]

Correct Answer: C

Solution :

                 \[\operatorname{Re}sis\tan ce=\frac{V}{I}\]                 So,          \[{{R}_{2}}>{{R}_{1}}\] \[\therefore \]  \[{{T}_{2}}>{{T}_{1}}\]