CUET · PHYSICS · PYQ PAPER 2025
A 200 turns closely wound circular coil of radius 10 cm carries a current of 3.5 A. The magnetic moment of the coil is
- A \(22 \text{ A m}^2\)
- B \(220 \text{ A m}^2\)
- C \(110 \text{ A m}^2\)
- D \(1.26 \text{ A m}^2\)
Answer & Solution
Correct Answer
(A) \(22 \text{ A m}^2\)
Step-by-step Solution
Detailed explanation
\(M = nIA\) \(A = \pi r^2\) \(M = nI(\pi r^2)\) \(M = 200 \times 3.5 \times \pi (0.1)^2\) \(M = 700 \times \pi \times 0.01 = 7\pi \approx 22 \text{ A m}^2\)
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