This is usually caused by the delay in molecular polarization with respect to a changing electric field in a dielectric medium eg inside capacitors or between two large conducting surfaces. The dielectric constant is a number without dimensions.

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### Dielectric constant of a substance can be defined as.

**Dielectric constant**. It is an expression of the extent to which a material concentrates electric flux and is the electrical equivalent of relative magnetic permeability. The dielectric constant dk of a plastic or dielectric or insulating material can be defined as the ratio of the charge stored in an insulating material placed between two metallic plates to the charge that can be stored when the insulating material is replaced by vacuum or air. It denotes a large scale property of dielectrics without specifying the electrical behaviour on the atomic scale.

It is unfortunate that the same symbol k is often used for coulombs constant so one must be careful of this possible confusion. Dielectric constant is a measure of the charge retention capacity of a medium. The value of the static dielectric constant of any material is always greater than one its value for a vacuum.

The dielectric constant is the ratio of the permittivity of a substance to the permittivity of free space. Likewise relative permittivity is the ratio of the capacitance of a capacitor using that material as a dielectric compared with a similar capacitor that has vacuum as its dielectric. Dielectric constant r is defined as the ratio of the electric permeability of the material to the electric permeability of free space ie vacuum and its value can derived from a simplified capacitor model.

The dielectric constant or permittivity e is a dimensionless constant that indicates how easy a material can be polarized by imposition of an electric field on an insulating material. Dielectric relaxation is the momentary delay or lag in the dielectric constant of a material. In general low dielectric constants ie polypropylene result in a fast substrate while large dielectric constants ie alumina result in a slow substrate.

The constant is the ratio between the actual material ability to carry an alternating current. It is also called as electric permittivity or simply permittivity. It is an important parameter in characterizing capacitors.

The ratio of the permittivity of the substance to the permittivity of the free space it expresses the extent to which a material can hold electric flux in it. Relative permittivity is also commonly known as the dielectric constant a term still used but deprecated by standards organizations in engineering 13 as well as in chemistry. The dielectric constant k is the relative permittivity of a dielectric material.

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