Evidence of mechanical instabilities of electrets in electric fields

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Abstract
Evidence of mechanical instabilities of an electret in an electric field is reported. It is shown, by a simple calculation of the forces acting on a surface‐charged electret, that the electret may have monostable or bistable behaviors, depending on its charge densities and on the geometrical characteristics of the system. The threshold voltages allowing the switching are calculated. A comparison is made between theory and experiment.

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