How much length of a very thin wire is r...

How much length of a very thin wire is required to obtain a solenoid of length `l_(0)` and inductance `L`

`sqrt((2piL l_(0))/(mu_(0)))`

`sqrt((4piL l_(0))/(mu_(0)^(2)))`

`sqrt((4piL l_(0))/(mu_(0)))`

`sqrt((8piL l_(0))/(mu_(0)))`

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