Physics - Magnetism Question with Solution | TestHub

$\begin{array}{l}B=\frac{{\mu }_{0}i}{2r},A=\pi r^2,r=\sqrt{\frac{A}{\pi }}\\ m=iA=\frac{B\times 2r}{{\mu }_o}\times \pi r^2\\ =\frac{2B}{{\mathrm{\mu }}_o}\pi r^3\\ =\frac{2B\pi }{{\mathrm{\mu }}_o}{\left(\frac{A}{\pi }\right)}^{\frac{3}{2}}\\ =\frac{2BA}{{\mathrm{\mu }}_o}\sqrt{\frac{A}{\pi }}\end{array}$