CUET · PHYSICS · PYQ PAPER 2023

A circular loop is placed in the plane of the paper in a magnetic field B. A current is induced in the loop in an anticlockwise direction. This is because the magnetic field B is:

A parallel to the plane of the loop and increasing with time
B inward and decreasing with time
C outward and decreasing with time
D outward and increasing with time

Verified Solution

Answer & Solution

Correct Answer

(C) outward and decreasing with time

Step-by-step Solution

Detailed explanation

Anticlockwise induced current \(\implies\) induced B-field is outward. By Lenz's Law, an outward induced B-field opposes a decrease in outward magnetic flux. Therefore, the magnetic field B is outward and decreasing with time.

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 (Motion of a charge particle)	List-II (Path)
(A) Initial velocity of charge particle parallel to B	(I) Circular Path
(B) Initial velocity of charge particle perpendicular to B	(II) Helical Path
(C) Initial velocity of charge particle inclined to B	(III) Straight Path
(D) Initial velocity of charge particle perpendicular to E	(IV) Parabolic Path

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