NEET2025Physics-Magnetic Moment of Current Loop
NEET 2025 Physics Effect of Coil Radius MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A 2 amp current is flowing through two different small circular copper coils having radii ratio 1:2. The ratio of their respective magnetic moments will be
A
1:4
B
1:2
C
2:1
D
4:1
Correct Answer
Option A
Detailed Explanation
Magnetic moment M = nIA, where A is the area. Since area is proportional to the square of the radius, the ratio of magnetic moments is (1²):(2²) = 1:4.
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