CUET · PHYSICS · PYQ PAPER 2025

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed \( \omega \). The ratio of the magnitude of its magnetic moment (m) to that of its angular momentum (L) depends on

A m and \( \omega \) only
B m and q only
C m, \( \omega \) and q
D \( \omega \) and q only

Verified Solution

Answer & Solution

Correct Answer

(B) m and q only

Step-by-step Solution

Detailed explanation

\( m = (1/2) q \omega r^2 \) \( L = mr^2 \omega \) \( \frac{m}{L} = \frac{(1/2) q \omega r^2}{mr^2 \omega} = \frac{q}{2m} \) The ratio depends on m and q only.

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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(A) X-rays	(I) 1 mm to 700 nm
(B) Radio waves	(II) 0.1 m to 1 mm
(C) Infrared waves	(III) 1 nm to \( 10^{-3} \) nm
(D) Microwaves	(IV) >0.1 m