CUET · PHYSICS · PYQ PAPER 2025

An emf \( E = 200 \sin 300t \text{ volt} \) is applied across an inductor coil having a resistance of \( 1.0 \text{ } \Omega \). If the maximum current is found to be 10 A, then the value of inductance is approximately:

A 23 mH
B 41 mH
C 67 mH
D 53 mH

Verified Solution

Answer & Solution

Correct Answer

(C) 67 mH

Step-by-step Solution

Detailed explanation

\(Z = \frac{E_{max}}{I_{max}} = \frac{200 \text{ V}}{10 \text{ A}} = 20 \text{ } \Omega\) \(X_L = \sqrt{Z^2 - R^2} = \sqrt{20^2 - 1.0^2} = \sqrt{399} \approx 19.975 \text{ } \Omega\) \(L = \frac{X_L}{\omega} = \frac{19.975}{300} \approx 0.06658 \text{ H} \approx 67 \text{ mH}\)

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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