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)

$T_1 > T_2$

Answer 2

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 $T_1 > T_2$.