CUET · PHYSICS · PYQ PAPER 2023

Which of the following is an incorrect statement?

A Copper loss can be minimised using thick wires.
B Iron loss cannot be minimised by taking laminated cores.
C Hysteresis loss can be minimised by using a magnetic material which has a low hysteresis loss.
D Leakage of magnetic flux can be reduced by winding the primary over the secondary coil

Verified Solution

Answer & Solution

Correct Answer

(B) Iron loss cannot be minimised by taking laminated cores.

Step-by-step Solution

Detailed explanation

Iron loss consists of two parts: eddy current loss and hysteresis loss. Eddy current loss is specifically reduced by using laminated cores, as the thin, insulated layers break up the paths for circulating currents. Statement B is false because laminations are the standard way to…

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	List-II
(A) Electric potential V due to a single charge	(I) \(\propto r^0\)
(B) Electric flux due to a positive point charge through sphere of radius r	(II) \(\propto \frac{1}{r^2}\)
(C) Electric intensity E due to a point charge	(III) \(\propto \frac{1}{r}\)
(D) Electric intensity E due to dipole	(IV) \(\propto \frac{1}{r^3}\)

Choose the correct answer from the options given below :

CUET 2023 Hard

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