RE: Spheres vs Toroids

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

Original poster: "Godfrey Loudner" <ggreen-at-gwtc-dot-net> 

Hello Antonio

You message was sent from the tesla list around noon here, but I just
got it around 5 hours later. Other messages are also arriving very late.
Well there's nothing I can do about it.

The book "Field Theory For Engineers, Moon and Spencer, Van Nostrand, 1961"
calculates a "Legendre" type expression for the potential P surrounding
a torus. I imagine you can get the field using E = -grad(P). This expression
for P is used to get the exact formula for the capacitance of a torus.
The pages are 368 to 376. Do you want me to scan and send? Right now, I
don't
know what would happen to this expression for E as you descend to the
surface
of a torus. I have to check that out over the next few nights.

Godfrey Loudner
ron in the hole...

Do you have some idea about how to calculate the electric field at
the toroid surface?

Antonio Carlos M. de Queiroz