Re: Inductance of single turn

[inet@intellisys.net (brian whatcott)]

At 05:09 PM 4/16/97 MDT, Alex. F. Burr wrote:
>      Inductance of a single turn aprox.
>
>                 L in micro H = (2.5 d) * (2.5 d)/ (2.5 * 18 * d)
> -
> where d is in cm.
This looks rather like an empirical formula suitable for single layer 
close-wound coils of diameter d inches, number of turns n, and length y inches

L(uH) = d^2.n^2/(18d + 40y) 

By comparison,  a single turn of #12 bare copper wire with half inch leads 
was measured at 45 nanohenries.

As you can see, empirical formulae for single turns are not the most accurate.

brian whatcott <inet@intellisys.net>
Altus OK