Concept

Electric displacement field

Summary
In physics, the electric displacement field (denoted by D) or electric induction is a vector field that appears in Maxwell's equations. It accounts for the electromagnetic effects of polarization and that of an electric field, combining the two in an auxiliary field. It plays a major role in topics such as the capacitance of a material, as well the response of dielectrics to electric field, and how shapes can change due to electric fields in piezoelectricity or flexoelectricity as well as the creation of voltages and charge transfer due to elastic strains. In any material, if there is an inversion center then the charge at, for instance, +x and -x are the same. This means that there is no dipole. If an electric field is applied to an insulator, then (for instance) the -ve charges can move slightly towards the +ve side of the field, and the +ve charges in the other direction. This leads to an induced dipole which is described as a polarization. There can be
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