MCQ
The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which is correct
- A$T_1 > T_2$
- ✓$T_1 < T_2$
- C$T_1 = T_2$
- Dnone
✓
Answer
Correct option: B.
$T_1 < T_2$
b
According to Ohm's law $R=\frac{V}{I}$
According to Ohm's law $R=\frac{V}{I}$
Where $R=$ resistance $V=$ Voltage $I=$ Current
Also $R$ is directly proportional to temperature $T$ and inversely proportional to the slope.
$\therefore$ from the above example
$R_{1} \propto T_{1}$ and $R_{2} \propto T_{2}$
but from given figure $R_{1} < R_{2}$
$\therefore T_{1} < T_{2}$
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