Hi. It is supposed that External field imposes to dielectric matter and Polarization occurs. Thus, Bounded volumb and surface charge are made. My question is, is field induced by Bounded charge in addition to original(external) field different from original field existing alone(Situation in which There is no matter causing Polarization)? I think and Textbook said it is different. But Someone said Just magnitude of field changes without direction. I'd like to make it sure.