BIOCHEM 2EE3 Lecture Notes - Lecture 2: Permittivity, Relative Permittivity, Electric Field
2 Feb 2016
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Document Summary
Relative permittivity: the factor by which the electric field between the charges is decreased relative to a vacuum. Represented by the dielectric constant in coulomb"s law. Permittivity is a material property that expresses the force between two point charges in the material. Energy of interaction (e): bond formation and cleavage involves a change in energy not force the energy required to pull apart two charged particles. Energy of 2 oppositely charged objects is always negative (attraction), but approaches zero as the distance (r) separating the two objects increases. Molecules that do not necessarily have a net negative charge but have an asymmetric internal distribution of charge polarity. Dipole moments produce unequal sharing of electrons determine the magnitude of the molecule"s polarity. Molecules with large dipole moments are highly polar. Induced dipoles: molecules with no permanent dipole moments can have induced dipole moments expose them to an electric field (a charged entity).
