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*To*: tesla-at-pupman-dot-com*Subject*: Re: New Inductance Formula*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Fri, 03 May 2002 20:39:26 -0600*Resent-Date*: Fri, 3 May 2002 21:19:16 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <O7njqD.A.5FH.uM108-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Shaun Epp by way of Terry Fritz <twftesla-at-qwest-dot-net>" <scepp-at-mts-dot-net> Hello Dave, Antonio, and All I wanted to know where your correction factor comes from, >> Add a "correction factor" to the denominator, replacing l by (l+0.9*r): And Dave, the reason that inductance formula is way off is because it is missing a "pi", see below: ----- Original Message ----- From: "Tesla list" <tesla-at-pupman-dot-com> To: <tesla-at-pupman-dot-com> Sent: Friday, May 03, 2002 6:20 PM Subject: RE: New Inductance Formula > Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org> > > Hi Jim, > > >>>The inductance of a long solenoid is given, theoretically, by: > >>> eq1 >L=u0*a*N^2/l H > >> Where did you find this formula? > > >This is sort of the fundamental definition of inductance of a coil... from > first principles. You'll find it in any first year physics text. > > In the book Physics, by Edward R. McCliment, Univ of Iowa, the formula for > self inductance is given as: > > 4pi * km * R^2 * N^2 > Lself = -------------------- l Should read: 4 * pi^2 * 10^-7 * R^2 * N^2 Lself = ---------------------------------- l which is the expanded version of that physics text inductance formula for a long selenoid. I expanded u and area. --snip-- Shaun Epp

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