CUET · PHYSICS · PYQ PAPER 2023

The metre bridge wire is made of alloys such as nichrome because they have :

A high temperature coefficient of resistance and high resistivity
B low temperature coefficient of resistance and low resistivity
C low temperature coefficient of resistance and high resistivity
D high temperature coefficient of resistance and low resistivity

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Answer & Solution

Correct Answer

(C) low temperature coefficient of resistance and high resistivity

Step-by-step Solution

Detailed explanation

High Resistivity: This allows a relatively short (1 meter) wire to have a significant, measurable resistance. Low Temperature Coefficient: As current passes through the wire, it heats up. A low coefficient ensures that this temperature change doesn't significantly alter the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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LIST 1	LIST 2
A. \(Cr ^{3+}\)	I. \(d^3\) configuration
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C. \(Cu ^{+}\)	III. Paramagnetic
D. \(Ti ^{4+}\)	IV. Diamagnetic