CUET · PHYSICS · PYQ PAPER 2025

A current of 10 A is flowing in a wire of length 1.2 m. A force of 12 N acts on it when it is placed in a uniform magnetic field of 2 T. The angle between the magnetic field and the direction of the current is

A \(30^\circ\)
B \(45^\circ\)
C \(60^\circ\)
D \(90^\circ\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(30^\circ\)

Step-by-step Solution

Detailed explanation

\(F = BIL \sin\theta\) \(12 = (2)(10)(1.2) \sin\theta\) \(\sin\theta = \frac{12}{24} = 0.5\) \(\theta = 30^\circ\)

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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