Two concentric circular loops of radii $r_{1}=30 \mathrm{~cm}$ and $r_{2}=50 \mathrm{~cm}$ are placed in $\mathrm{X}-\mathrm{Y}$ plane as shown in the figure. A current $I=7 \mathrm{~A}$ is flowing through them in the direction as shown in figure. The net magnetic moment of this system of two circular loops is approximately :

Question

$\frac{7}{2} \hat{k} \,\mathrm{Am}^{2}$

$-\frac{7}{2} \hat{k} \,\mathrm{Am}^{2}$

${7}\, \hat{k} \,\mathrm{Am}^{2}$

${-7}\, \hat{k} \,\mathrm{Am}^{2}$

Solution

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