self inductance

What is self inductance of solenoid I have seen the formula L = u0 N^2 A/l But in this question the used some other formula why?
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@Gyro Gearloose
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trin
trin9mo ago
both the formulas are different N is total number of turns N= nl n= N/l i.e total number of turns per unit length if you want n in the formula the formula would be u0n^2Al whereas for N, its the one you are saying
Gamertug
GamertugOP9mo ago
Oh ic +solved @trin
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