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Re: funny capacitor



Bob Sciamanda wrote:

Here is your bug! You are forcing one of your local
conductors to always be at the same (zero) potential
even when charges vary on it and other conductors.
You can choose any spacepoint as your potential
reference, but - unless it is at infinity - its potential
relative to other points (and infinity) will vary as the
charges on your N conductors vary.

The "infinity" can be a conducting wall (object #4)
which is sufficiently distant from other conductors
(to make the net force on a probe charge, caused by
Q1, Q2 and Q3, negligibly small). In my program the
boundary of the enclosure was a square at |x|=101 and
|y|=101 cells. The funny capacitor was in the center;
it was inside the square of |x|=11 and |y|=11 cells.
That is far enough. I can move the enclosing wall
further away but this will also give me a singular
matrix of Cij coefficients.
Ludwik Kowalski