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Material Science and Metallurgy by U. C. Jindal

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19

Dielectric Properties

19.1 INTRODUCTION

A dielectric material is an electrically insulating material (non-metallic) and it exhibits an electric dipole structure. Electrically charged positive and negative dipoles are separated on a molecular or atomic level. The properties of dielectrics are due to polarization of the substance of dielectric. Due to polarization, dielectric stores energy and makes it available when electric field is reversed.

The effectiveness of a dielectric is measured by its ability to store energy and is expressed in terms of ‘dielectric constant’. The ability of a dielectric to withstand electric field without losing its insulating property is known as ‘dielectric strength’. Because of this ability, it is used in capacitance. ...

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