Difine relation permittivity of dielectrics constant?
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\kappa=\frac {E} {E_{0}}
\kappa = dielectric constant
{E} = permittivity of the substance
{E_{0}} = permittivity of a vacuum
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The relative permittivity, or dielectric constant, of a material is its (absolute) permittivity expressed as a ratio relative to the vacuum permittivity. ... Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum
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