CUET · PHYSICS · PYQ PAPER 2023

A bar magnet falls freely from a height of 9.8 m through a metal ring. Its acceleration will be equal to

A zero
B equal to \( 9.8 \text{ m/s}^2 \)
C more than \( 9.8 \text{ m/s}^2 \)
D less than \( 9.8 \text{ m/s}^2 \)

Verified Solution

Answer & Solution

Correct Answer

(D) less than \( 9.8 \text{ m/s}^2 \)

Step-by-step Solution

Detailed explanation

Due to Lenz's law, an opposing magnetic force acts upwards on the falling magnet. This upward force reduces the net downward force on the magnet. Therefore, its acceleration \( a Thus, \( a < 9.8 \text{ m/s}^2 \).

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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