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*To*: tesla-at-pupman-dot-com*Subject*: Re: for Inductance Calculation*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Fri, 13 Apr 2001 22:56:30 -0600*Resent-Date*: Fri, 13 Apr 2001 23:11:58 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <CJ1VY.A.9HE.bw916-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net> > The formula L=Nr*2/9r+10h........for a single layer air coil. > > Matt, the 9 and 10 in the denominator equation, are those a constant of > some sort??? and of what sort??? That's the Wheeler formula, and is an approximation for single layer coils that accounts for things like end effects, etc. > > This is the formula I have; L=N(squared) x permeability x A / l > > L is inductance in henries > > N is # of turns > > Permeability is a constant of 1 (for air cores) > > A = area of core > > l = length of coil > That's the formula for an idealized solenoid, ignoring end effects and "inter turn" interactions.

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