question_answer

The current-voltage graph for a given metallic conductor at two different temperature \[{{T}_{1}}\]and \[{{T}_{2}}\]are as shown in the figure. Then:

A)  \[{{T}_{1}}<{{T}_{2}}\]

B)  nothing can be said about\[{{T}_{1}}\] and \[{{T}_{2}}\]

C)   \[{{T}_{1}}={{T}_{2}}\]

D)  \[{{T}_{1}}>{{T}_{2}}\]

Correct Answer: A

Solution :

\[R\propto \]temperature for conductor \[\therefore \] \[\frac{V}{I}=R\] At \[{{T}_{2}},R\]is greater than \[{{T}_{1}}\] Hence,      \[{{T}_{2}}>{{T}_{1}}\]