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What is a dielectric? State its two types. Give two examples in each case. |
Answer» A dielectric is an electrical insulator i.e., a nonconducting material, that can be polarised by an applied electric field which slightly displaces the positive and negative charges of each molecule. A dielectric can sustain a high electric field up to a certain limit. An ideal dielectric has no free charges. Important commercial dielectrics are of two types, polar and nonpolar. Examples : Polar dielectrics : Silicones, halogenated hydrocarbons. Nonpolar dielectrics : (1) Solid : Ceramics, glasses, plastics (polyethylene, polystyrene, etc.) mica, paper. (2) Liquid : Mineral oils. |
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