Length of thin wire needed to make a solenoid of given length and inductance

1. A.
   0.10 m
2. B.
   0.10 km
3. C.
   1 km
4. D.
   10 km

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1. A.
   $\left\lbrack \frac{4\pi lL}{\mu_{0}} \right\rbrack^{\frac{1}{2}}$
2. B.
   $\left\lbrack \frac{2\pi l}{\mu_{0}\text{ }L} \right\rbrack^{\frac{1}{2}}$
3. C.
   $\left\lbrack \frac{4\pi\mu_{0}}{LL} \right\rbrack^{\frac{1}{2}}$
4. D.
   $\left\lbrack \frac{2\pi\mu_{0}\text{ }L}{l} \right\rbrack^{\frac{1}{2}}$

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