Dielectric material
From PESWiki
A dielectric, or electrical insulator, is a substance that is highly resistant to electric current. Although a vacuum is also an excellent dielectric, the following discussion applies primarily to physical substances.
A dielectric tends to concentrate an applied electric field (e-field) within itself. As the dielectric interacts with the applied electric field, charges are redistributed within the atoms or molecules of the dielectric. This redistribution alters the shape of the applied electrical field both inside and in the region near the dielectric material.
When a dielectric material is placed between two electric charges it decreases the effective force between them and, when an electromagnetic wave travels through a dielectric, the velocity of the wave will be reduced and it will behave as if it had a shorter wavelength.
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