1.

How much length of a very thin wire is required to obtain a solenoid of length \[{{l}_{0}}\] and inductance L

A.            \[\sqrt{\frac{2\pi L{{l}_{0}}}{{{\mu }_{0}}}}\]             
B.            \[\sqrt{\frac{4\pi L{{l}_{0}}}{\mu _{0}^{2}}}\]
C.            \[\sqrt{\frac{4\pi L{{l}_{0}}}{{{\mu }_{0}}}}\]             
D.            \[\sqrt{\frac{8\pi L{{l}_{0}}}{{{\mu }_{0}}}}\]
Answer» D.            \[\sqrt{\frac{8\pi L{{l}_{0}}}{{{\mu }_{0}}}}\]


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