CUET · PHYSICS · PYQ PAPER 2025

An induced emf is produced when a magnet is plunged into a coil. The magnitude of the induced emf is independent of

A the strength of the magnet
B the speed at which the magnet is moved
C the resistivity of the wire of the coil
D the number of turns in the coil

Verified Solution

Answer & Solution

Correct Answer

(C) the resistivity of the wire of the coil

Step-by-step Solution

Detailed explanation

According to Faraday's Law, the magnitude of induced emf \((\varepsilon)\) depends on the number of turns and the rate of change of magnetic flux: \(\varepsilon=-N \frac{d \phi}{d t}\) While the resistivity of the wire determines the amount of induced current that flows, it does…

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-I	List-II
A. Reactance	(I) LCR Circuit
B. Inductance	(II) \(\frac{\rho l}{\pi r^2}\)
C. Capacitance	(III) \(\frac{\varepsilon_0 A}{d}\)
D. Impedance	(IV) \(\frac{\mu_0 N^2 A}{L}\)