Dielectric means that the molecules of the material are polar ones (the charge is not homogeneously distributed). Normally the poles of the molecules have not a particular orientation, but, when that molecules are near to a electric field, the material is polarized because all positive poles are pointing to a particular direction (and negative to the opposite direction).

Dielectric means that the molecules of the material are polar ones (the charge is not homogeneously distributed). Normally the poles of the molecules have not a particular orientation, but, when that molecules are near an electric field, the material is polarized because all positive poles are pointing to a particular direction (and negative to the opposite direction).