Select the correct statement.

Which of the following statements is correct?

The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which of the following is correct?

For a metallic wire,the ratio $V/i$ ($V =$ the applied potential difference,$i =$ current flowing) is

For a wire,$\frac{R}{l} = \frac{1}{2} \, \Omega/cm$ and the length of the wire is $l = 5 \, cm$. If a potential difference of $1 \, V$ is applied across it,the current through the wire will be: $(R = \text{Resistance})$ (in $A$)

How is the $V-I$ graph of a material following Ohm's law?