Re: A funny capacitor.

[Roger Haar <haar@PHYSICS.ARIZONA.EDU>]

Ludwik,
        If the lower plate is placed symmetrically
between the other two plates, then at some point
along it the potential will be the average of the
other two, or zero.  No other potential would
preserve the symmetry.

Thanks
Roger Haar

*********************************************

Ludwik Kowalski wrote:
> snip...................
>            *           *
>            *           *
>  -50 *******           ******* +50
>            *           *
>            *           *
>
>              *********
>                 *
>                 * "floating"
>
> But how can the problem be solved when the lower plate is
> floating. That plate will certainly find its own potential, that
> is it will adjust to potentials on other plates. But I do not
> know to find that potential. Therefore the Laplace equation
> has an undefined boundary condition. Is this problem
> solvable? Note that plates are in fixed positions with
> respect to each other.
>
> snip ..........................