CUET · PHYSICS · PYQ PAPER 2023
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
(B) 220 \( \text{A m}^{2} \)
Step-by-step Solution
Detailed explanation
\(A = \pi r^2 = \pi (0.1 \text{ m})^2 = 0.01\pi \text{ m}^2\) \(M = NIA = 200 \times 3.5 \text{ A} \times 0.01\pi \text{ m}^2 = 7\pi \text{ A m}^2 \approx 21.99 \text{ A m}^2\) \(M \approx 22 \text{ A m}^2\)
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