define di-electric constant?
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The relative permittivity, or dielectric constant, of a material is its permittivity expressed as a ratio relative to the vacuum permittivity. Permittivity is a material's property that affects the Coulomb force between two point charges in the material.
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The Coulomb constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in electrostatics equations. In SI units it is equal to 8.9875517923(14)×109 kg⋅m3⋅s−2⋅C−2.
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