Re: conserving Q/ Faraday

[brian whatcott <inet@INTELLISYS.NET>]

At 22:46 12/8/98 +0100, you wrote:
> A new sequence of measurements.
>
> If a net charge really accumulates in the dielectric sheet then its
> presence
> should be detectable when the entire capacitor (two aluminum blocks
> and a Lexan sheet) is lowered into the Faraday cup after being
> discharged.
> But this does not happen; the net charge on the entire capacitor is
> zero.
> We checked this several times. And we know that a net charge appears
> on Lexan after it is removed from the dissectable capacitor and lowered
> into the Faraday cup (see data below).
...
> Ludwik Kowalski
I looked at Standard Handbook for Electrical Engineers,
Knowlton, McGraw-Hill and found this paragraph on absorption.

Capacitors which have been under DC voltage for some time
 (as short as five minutes in some cases) will build up a sizable charge
by themselves after being apparently thoroughly discharged following their
removal from the voltage supply. The higher the voltage and the longer it
has been applied, the higher the built-up charge and the sooner it will
appear.

[elsewhere] capacitors can be sensitive to both temperature and humidity....



brian whatcott <inet@intellisys.net>
Altus OK