Dielectric Properties of Solids

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Insulators do not conduct electricity because the electrons present in them are held tightly to the individual atoms or ions and are not free to move. However when electric field is applied polarization takes place because the nucleus is attracted towards cathode and electron cloud towards anode.

fig 2.38These formed dipoles may align themselves in an ordered manner. So that the crystal has net dipole moment.

Such polar crystals show following electrical properties.