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i. Relative permittivity or dielectric constant is the ratio of absolute permittivity of a medium to the permittivity of free space. It is denoted as K or εr.
i.e., K or εr = ε/ε0
ii. It is the ratio of the force between two point charges placed a certain distance apart in free space or vacuum to the force between the same two point charges when placed at the same distance in the given medium.
i.e., K or εr = \(\frac{F_{vacuum}}{F_{medium}}\)
iii. It is also called as specific inductive capacity or dielectric constant.
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