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The free electrons in practical dielectrics are due to ________(a) There are no free electrons(b) Conductors(c) Impurities(d) Displacement currentsI had been asked this question in semester exam.Enquiry is from Displacement Current in a Dielectric in section Capacitance and Capacitors of Basic Electrical Engineering

Answer»

The correct option is (c) IMPURITIES

Easy explanation: 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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