Where did the $l$ in the denominator come from? I am talking about the $l$ in muNI/2l[...]? I can't match LHS and RHS.
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$\begingroup$ Looks like a typo. The dimensions are not consistent. $\endgroup$– MechanicCommented Jun 3, 2022 at 6:00
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$\begingroup$ Typo, as the middle formula should have $\ell$ in the denominator. $\endgroup$– FarcherCommented Jun 3, 2022 at 7:11
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Seems to be a typo. Usually it is $N_0$ which number of turns in a unit length. After everything is calculated it is usually expanded out to N/l. Where N is the number of turns in the solenoid and l is the length of the solenoid.
