Magnetic moment of a coil from its field at the centre

1. A.
   $\frac{2}{\mu_0 \pi^{1/2}} B A^{3/2}$
2. B.
   $\frac{B A^{3/2}}{\mu_0 \pi}$
3. C.
   $\frac{2 B A^{3/2}}{\mu_0 \pi^{1/2}}$
4. D.
   $\frac{B A^2}{\mu_0 \pi}$

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1. A.
   $\frac{BA^2}{\mu_0\pi}$
2. B.
   $\frac{2BA^{3/2}}{\mu_0\pi}$
3. C.
   $\frac{BA^{1/2}}{\mu_0\pi^{1/2}}$
4. D.
   $\frac{2BA^{3/2}}{\mu_0\pi^{1/2}}$

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1. A.
   $\frac{BR^{3}}{2\pi\mu_{0}}$
2. B.
   $\frac{2\pi BR^{3}}{\mu_{0}}$
3. C.
   $\frac{BR^{2}}{2\pi\mu_{0}}$
4. D.
   $\frac{2\pi BR^{2}}{\mu_{0}}$

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1. A.
   $2x$
2. B.
   $\frac{x}{2}$
3. C.
   $\frac{x}{4}$
4. D.
   $\frac{x}{8}$

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1. A.
   $\frac{{BA}^{2}}{\mu_{0}\pi}$
2. B.
   $\frac{2BA^{3/2}}{\mu_{0}\sqrt{\pi}}$
3. C.
   $\frac{BA^{3/2}}{\mu_{0}\pi}$
4. D.
   $\frac{\mu_{0}\sqrt{\pi}}{{BA}^{3/2}}$

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1. A.
   $\dfrac{x}{27}$
2. B.
   $\dfrac{x}{9}$
3. C.
   $\dfrac{x}{3}$
4. D.
   $3x$

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