Magnetic field at the centre of a circular loop of area \( A \) is ...

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Magnetic field at the centre of a circular loop of area \( A \) is \( B \). The magnetic moment of the loop will be
(a) \( \frac{B A^{2}}{\mu_{0} \pi} \)
(b) \( \frac{B A^{3 / 2}}{\mu_{0} \pi} \)
(c) \( \frac{B A^{3 / 2}}{\mu_{0} \pi^{1 / 2}} \)
(d) \( \frac{2 B A^{3 / 2}}{\mu_{0} \pi^{1 / 2}} \)
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