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Re: Electrostatics problem

-----Original Message-----
From: Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>
To: PHYS-L@LISTS.NAU.EDU <PHYS-L@LISTS.NAU.EDU>
Date: Tuesday, March 02, 1999 4:30 PM
Subject: Re: Electrostatics problem


In case anybody may be interested here is the distribution
of potential V(x,y) inside a two-dimensional metallic
container.
. . .
I can
calculate charge densities from these numbers sigma=
2*epsilon*grad(V).


Nit to pick:
The surface charge density on a conductor is given by
sigma = epsilon*E (you have an extra factor of 2),
where E is the net field, due to the universe, just off the conducting
surface.
(Deja-vue all over again!)

Queries:
(1) What were your input boundary conditions, besides V=100 on the three
conducting surfaces?
(2) Is this a commercial finite element program? If not please describe its
general algorithm.

Bob Sciamanda
Physics, Edinboro Univ of PA (ret)
trebor@velocity.net
http://www.velocity.net/~trebor