STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Moment MCQ Question
Type: MCQ-numerical-Medium
A circular coil of 300 turns and diameter 14 cm carries a current of 15 A. The magnitude of magnetic moment associated with the loop is
A
51.7 J T⁻¹
B
69.2 J T⁻¹
C
38.6 J T⁻¹
D
19.5 J T⁻¹
Correct Answer
Option B
Detailed Explanation
The magnetic moment M is given by M = NIA = NI × πr². Here, N = 300, I = 15 A, r = 7 cm = 7 × 10⁻² m. Therefore, M = 300 × 15 × 3.14 × (7 × 10⁻²)² = 69.2 J T⁻¹.
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