CUET · PHYSICS · PYQ PAPER 2025
The current-voltage graphs for a given metallic wire at two different temperatures, \( T_1 \) and \( T_2 \) are shown in the figure. The correct relation of temperatures and resistances will be :
- A \( R_{T2} = R_{T1}, T_1 > T_2 \)
- B \( R_{T2} < R_{T1}, T_1 > T_2 \)
- C \( R_{T2} > R_{T1}, T_2 > T_1 \)
- D \( R_{T2} < R_{T1}, T_2 > T_1 \)
Answer & Solution
Correct Answer
(C) \( R_{T2} > R_{T1}, T_2 > T_1 \)
Step-by-step Solution
Detailed explanation
Slope of I-V graph = \( \frac{1}{R} \) From graph, Slope \( (T_1) > \) Slope \( (T_2) \) \( \frac{1}{R_{T1}} > \frac{1}{R_{T2}} \) \( R_{T1} For a metallic wire, R increases with T, so \( R_{T1} Thus, \( R_{T2} > R_{T1}, T_2 > T_1 \)
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