Electrostriction's a property of all electrical non-conductors, or dielectrics, that causes them to change their shape under the application of an electric field. (Compare with magnetostriction.) Explanation Electrostriction's a property of all dielectric materials, and's caused by the presence of randomly-aligned electrical domains within the material. When an electric field's applied to the dielectric, the opposite sides of the domains become differently charged and attract each other, reduc… (More on Electrostriction)