"interactions between polar materials and electric field" sorry typing error. polar materials are those who have a permanent dipole ( like water molecules ) but these dipoles doesn't appear on the macroscopic scale due to their random orientation , so what if this polar medium is subjected to some electric field , the dipoles will align them selves and the medium will be polarized to oppose the outward field. now if the outward field is gone , would the dipoles remain as they are ? and would the dipoles in the medium some up to be significant in the macroscopic scale ? or would the dipoles be randomly oriented again? and what will happen in the same case but if the material medium was non-polar ?