Positive ion impact in gaseous insulating material
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Let us consider a parallel plate capacitor having gas as in insulating medium and separated by a distance as shown in Fig.2.1. Let us assume that n0 electrons are emitted from the cathode. When one electron collides with a neutral particle, a positive ion and an electron are formed. This is called an ionizing collision ...
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Electrical breakdown or dielectric breakdown is when current flows through an electrical insulator when the voltage applied across it exceeds the breakdown voltage. Under sufficient electrical stress, electrical breakdown can occur within solids, liquids, gases or vacuum.
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