What are polar and non polar dielectric ,give one example each other ?Define di-electric constants.

NON POLAR DIELECTRICS:

• Are made of non-polar molecules.
• The center of mass of positive charges coincides with the center of mass of the negative charges, in the molecule.
• In its normal state (i.e., in the absence of any external force, esp electric field), each molecule has zero dipoles and
• has a symmetric shape.

POLAR DIELECTRICS:

• Are made of polar molecules.
• The center of mass of positive charges does not coincide with the center of mass of the negative charges, in the molecule.
• In its normal state (i.e., in the absence of any external force, esp electric field), each molecule has some intrinsic permanent dipole and
• has an asymmetric shape.

The dielectric constant is the ratio of the permittivity of a substance to the permittivity of free space. It is an expression of the extent to which a material concentrates electric flux, and is the electrical equivalent of relative magnetic permeability.