Question

The voltage-current graph for a metal wire of uniform area of cross section at two different temperatures $T$ and $T'$ is shown. Then choose the correct statement:

• A. Resistance of the conductor at temperature $T$ is greater than resistance of the conductor at temperature $T'$
• B. Temperature $T$ is greater than temperature $T'$
• C. Temperature $T'$ is greater than temperature $T$
• D. Resistivity is independent of temperature

Hint:

Always double-check the axis labels! On a V-I graph (V on y-axis), a steeper slope means more resistance. On an I-V graph (I on y-axis), a steeper slope means less resistance. Here, $T$ has a steeper slope, so it has less resistance and must be the cooler temperature!

Answer 1

The Correct Option is C