CUET · PHYSICS · PYQ PAPER 2025

If we double the number of turns in a moving coil galvanometer, the voltage sensitivity of the galvanometer

A Increases by 2 times
B Increases by 3 times
C increases by 4 times
D does not change

Verified Solution

Answer & Solution

Correct Answer

(D) does not change

Step-by-step Solution

Detailed explanation

Voltage sensitivity \(\left(V_s=\frac{N B A}{k R}\right)\) depends on the ratio of turns to resistance \((N / R)\). Doubling the number of turns ( \(N\) ) also doubles the resistance ( \(R\) ) of the wire, causing the two effects to cancel out and leave the sensitivity…

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.

Same subject

Match List-I with List-II

List -I Physical Quantity	List II Dimensional Formula
(A) Capacitance	(I) \( [M L^3 T^{-3} A^{-1}] \)
(B) Electric Flux	(II) \( [M L^2 T^{-3} A^{-1}] \)
(C) Potential	(III) \( [L^{-2} A T] \)
(D) Polarisation	(IV) \( [M^{-1} L^{-2} T^4 A^2] \)

Choose the correct answer from the options given below:

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