Re: Equivalent lumped inductance and toroidal coils

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi Paul,

This is a followup to my previous post on this subject.  If you continue to
want to represent the wire with a bundle of filaments,  you can start the
bundle at the center with a triad.  Then no filament will have an R=0.

Gerry R.

 > Original poster: "Paul Nicholson" <paul-at-abelian.demon.co.uk>
 >
 > Gerry wrote:
 >  > Yes, R=0 is a problem if you assume all the current is all
 >  > concentrated at R=0.
 >
 > Worse, it is a problem if *any* current is at R=0, so splitting the
 > single filament up into several spread over the current-carrying
 > area of the wire doesn't help - you'll still come up against the
 > need for self-inductance for each filament.  (I suppose if you just
 > leave out the self inductances you'll have some error, but only
 > slight if you have many filaments per wire.)
 >