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Dielectrics and Polarisation

Question

Define the relative permittivity of a medium.

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Solution

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The amount by which the force between the charge (in presence of medium) is relatively less than that in a vacuum, is called the dielectric constant of that medium or relative permittivity ($$\epsilon_r$$)

$$\epsilon_r=\dfrac{\text{Force between charges in air or vaccum}}{\text{Force between charges in medium}}$$

$$\therefore\,\,\varepsilon_r=\dfrac{\varepsilon}{\varepsilon_0}$$

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