d nixon,
Another interesting experiment would be to insert a metal plate inside the
dielectric so that you have: plate-dielectric-plate-dielectric-plate. The
middle plate (ground it?) should prevent any magnetic field from forming and
you may not be able to charge this capacitor at all.
Hmm... Where was the ground when this capacitor was charged. Did that
change. Too many loose ends to predict. My first reaction was that this
would be two series caps, which I think it is, grounding the center plate
threw the monkey wrench.
Jim