Electrets
The science of electricity is that state in which every part of it requires experimental investigation; not merely for the discovery of new effects, but the development of the means by which the old effects are produced, and the consequent more accurate determination of the first principles of action of the most extraordinary and universal power in nature.
Without experiment, I am nothing.
Michael Faraday
5.1 Introductory Remarks
An electret can be considered a piece of dielectric material with the presence of quasi-permanent real charges on the surface or in the bulk of the material, or frozen-in aligned dipoles in the bulk. An electret behaves like a battery or acts as an electrical counterpart of a permanent magnet. A piece ...
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