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The free electrons in practical dielectrics is due to _________(a) There are no free electrons(b) Conductors(c) Impurities(d) Both conductors and impuritiesI have been asked this question in an international level competition.This interesting question is from Leakage and Conduction Currents in Capacitors topic in division Capacitance and Capacitors of Basic Electrical Engineering

Answer»

Right answer is (C) Impurities

To explain I would say: IDEALLY, DIELECTRICS are INSULATORS and do not contain any free electrons. But no DIELECTRIC is a perfect dielectric, hence the free electrons are due to impurities present in each dielectric.



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