Wire of given length bent into a circular coil: magnetic moment or maximum torque

1. A.
   $\sqrt{\dfrac{M\pi}{4I}}$
2. B.
   $4\pi\left(\dfrac{I}{M}\right)^{1/2}$
3. C.
   $4\left(\dfrac{M}{\pi I}\right)^{1/2}$
4. D.
   $4\pi\sqrt{\dfrac{M}{I}}$

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1. A.
   $\frac{L^{2}B}{4\pi}$
2. B.
   $\ \frac{L^{2}IB}{4\pi}$
3. C.
   $\frac{L^{2}{\text{ }B}^{2}}{2}$
4. D.
   $\frac{L^{2}IB}{2}$

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1. A.
   $1$
2. B.
   $2$
3. C.
   $4$
4. D.
   As large as possible

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