NEET 2025 — Physics solution

NEET2025Physics

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

Solution

Magnetic moment of a current loop: $M = I A = I π r^{2}$ . With the same current,

$\frac{M _{1}}{M _{2}} = \frac{r _{1}^{2}}{r _{2}^{2}} = (\frac{1}{2})^{2} = \frac{1}{4}$ .

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