Re: Charge stored in Dielectric? Not really - MISCONCEPTION

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

Original poster: C T <ct451-at-yahoo-dot-com> 

There is a chance that the dielectric may become
polarised and positive and negative charges will move
near the plates of the capacitor. Some of the charge
is stored in this arrangement of the dielectric. This
leads to increased capacitance if a constant voltage
is applied. If the dielectric material is made up of
polar molecules like water, the increase in the charge
stored can be significant.

Chris

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Ed Phillips <evp-at-pacbell-dot-net>
 >
 > "
 > But wait he said one of the experiments was to do
 > exactly as the classic
 > one but at say 500 volts.  If the energy is truly
 > stored in the
 > dielectric it should work for any voltage level.
 >
 > At 500 volts the corona affect he describes should
 > be minimized.  When
 > this is done at 500 volts there is no charge left
 > after reassembling.
 >
 > Forget about the oil and trying to prevent that
 > corona from leaking onto
 > the dielectric.  Why wouldn't it work at 500 volts
 > if the charge was on
 > the dielectric?
 >
 > Luke Galyan
 > Bluu-at-cox-dot-net"
 >
 > 	If you perform the experiment CAREFULLY there will
 > indeed be charge
 > stored; of course, at the lower voltage the charge
 > will be
 > proportionally less.
 >
 > 	An anecdote.  I have a small Van de Graaf generator
 > which will put out
 > 6" sparks.  I also have a sack of very old
 > brown-colored polystyrene
 > cups.  In fooling around one day I discovered that
 > if I put my fist
 > inside one and let the discharge from the HV
 > terminal strike the outisde
 > I ended up with enough charge stored that I got a
 > potent and slightly
 > painful jolt when I took the cut away from the
 > generator and touched the
 > outside with my other hand. Certainly charge stored
 > somewhere.  If the
 > weather was/is dry, I could pick up a "charged" cup
 > a couple of days
 > later and still get a jolt!
 >
 > Ed
 >
 >