RE: Re charged insulators

["John Gastineau" <john@gastineau.org>]

Ludwik said:

> Suppose a properly selected plastic insulator is volume-electrified as
> above and allowed to solidify. You will have a permanently charged object
> with interesting properties. For example, a positive "pith ball" of 0.001 C
> and a negative one ...  And not only for classroom demos. A patentable
> project anyone?

If you can accept a permanent electric dipole moment instead of a permanent
charge, such an object called an "electret." They are used in cheap condenser
microphones, like the one on your computer or cell phone.

JEG

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John E. Gastineau      john@gastineau.org        	KC8IEW
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