CUET · PHYSICS · PYQ PAPER 2025

A 50 Hz alternating current is flowing in a 28 mH coil. The reactance of the coil is

A 88 \( \Omega \)
B 4.4 \( \Omega \)
C 8.8 \( \Omega \)
D 0.88 \( \Omega \)

Verified Solution

Answer & Solution

Correct Answer

(C) 8.8 \( \Omega \)

Step-by-step Solution

Detailed explanation

\(X_L = 2 \pi f L\) \(X_L = 2 \pi (50 \text{ Hz}) (28 \times 10^{-3} \text{ H})\) \(X_L \approx 8.80 \text{ } \Omega\)

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.Resistance	I.Property of the material
B.Super conductor	II.The capacity of supplying current in the circuit
C.Specific resistance	III.The collision of electrons while moving through the conductors.
D.Ampere-hour	IV.Motion of electrons through a conductor without any collision

Choose the correct answer from the options given below:

CUET 2023 Hard

A 10 V battery of negligible internal resistance is connected with a 200 V battery and a set of parallel resistances as shown in the figure. The value of current in the circuit.

CUET 2025 Hard

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