Question

Define relative permitivity or dielectric constant. What is the value of relative permitivity(or dielectric constant) of a perfectly insulating sheet?

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Answer 1

Explanation:

Hi,

Consider the dielectric permittivity as a fundamental parameter that effects the propagation of electric fields. It is measure of how electric field behaves/interacts with any material. You can use it (for example) to understand how easily an electric field will polarize a given dielectric material. Dielectric constant and loss tangent are both numerical values using which you can define permittivity of a dielectric material.

The permittivity of a dielectric material is denoted by 'ε'. This ε is related to the dielectric permittivity of vacuum, ε0 by a εr, which is called the relative permittivity, (also sometimes called the dielectric constant of the material).

Answer 2

$\bold {\huge {Answer :-}}$

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➛Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum. 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.

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➛The absolute permittivity of an insulating medium is the measure of the opposition offered by the medium to the electric force between two point charges. The absolute permittivity of free space is 1 and is greater for all other mediums.

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➛The relative permittivity or dielectric constant of an insulating medium is defined as the ratio of its absolute permittivity to the absolute permittivity of free space. It follows that the dielectric constant for free space is 1.

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✭Remember that more is the absolute permittivity of a medium,less is the electrostatic force in that medium and vice versa.✭