Which one of the following is the CORRECT expression for the self-inductance of a solenoid?

1
L = μ0N2AI
2
\(L = \frac{{{\mu _0}{N^2}A}}{l}\)
3
L = μ0NA2l
4
\(L = \frac{{{\mu _0}{N^2}{A^2}}}{I}\)

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