Question

The voltage $V$ and current. $I$ graphs for a conductor at two different temperatures $T_1$ and $T_2$ are shown in the figure.

The relation between $T_1$ and $T_2$ is

• A. $T_1>T_2$
• B. $T_1<T_2$
• C. $T_1=T_2$
• D. $T_1=\frac{1}{T_2}$

Answer 1

Answer: (A)

The slope of $V$-$I$ graph gives the resistance of a conductor at a given temperature.

From the graph, it follows that resistance of a conductor at temperature $T_1$ is greater than at temperature $T_2$. As the resistance of a conductor is more at higher temperature and less at lower temperature, hence $T_1>T_2$.