Inductance Formula for Rectangular Coil: Does L=N²μA/length Apply?

Hello everybody. It has been a while since I am trying to solve this problem.
As  you may know, in a coil we have:Φmagnetic=LI=NBA=N²μIA/lengthTherefore, L=N²μA/lengthWhat I want to know, is if this equation (L=N²μA/length) also works with rectangular coils. I am not so sure, because the B might not be NμI/length in a rectangular coil. Hope someone can help me.

Please check if this would be useful https://www.eeweb.com/tools/rectangle-loop-inductance Thanks

Short answer: This equation also works with rectangular coils. This equation assumes that length is large compared to sqrt(A). Maurizio's link is more accurate when length is small compared to sqrt(A).Long answer: See pages 35  and 36 of 237 pages in this PDF file:https://web.archive.org/web/20151002101401/http://home.comcast.net/~traneus/thesis.pdffor a compute-heavy more-general method. Four figures missing from the PDF are found here:https://web.archive.org/web/20151002101403/http://home.comcast.net/~traneus/thesifig.pdfU.S. Patent 1,172,017 is a reference missing from the PDF discussion of heterodyne radio receivers.

Tks