CUET · PHYSICS · PYQ PAPER 2023

The voltage sensitivity of a voltmeter can be increased by :
(A) decreasing the resistance of the voltmeter
(B) increasing the resistance of the voltmeter
(C) decreasing the torsional constant of spring
(D) increasing the number of turns of the coil
(E) taking a strong permanent magnet
Choose the correct answer from the options given below :

A (A), (B), (C), (E) Only
B (A), (C), (D), (E) Only
C (B), (C), (D), (E) Only
D (A), (D), (B), (C) Only

Verified Solution

Answer & Solution

Correct Answer

(B) (A), (C), (D), (E) Only

Step-by-step Solution

Detailed explanation

Voltage sensitivity \( S_V = \frac{NBA}{CR_V} \) \( S_V \) increases by: decreasing \( R_V \), decreasing \( C \), increasing \( N \), increasing \( B \). Matching question options: (A), (C), (D), (E). (A), (C), (D), (E) Only

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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