Question

Define polarization vector and displacement vector

Answer 1

Explanation:

The total dipole moment per unit volume is called Polarisation. Since it is more precisely a polarisation vector because inside the unit volume, many dipoles are present with dipole moment which itself is a vector(from -ve charge to +ve charge)…now what will be the direction of polarisation, it fully depends upon the external electrical field applied and whether the molecule is polar or non polar.

A displacement is a vector whose length is the shortest distance from the initial to the final position of a point P. It quantifies both the distance and direction of an imaginary motion along a straight line from the initial position to the final position of the point. A displacement may be identified with the translation that maps the initial position to the final position.

Answer 2

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P is also defined as the electric dipole moment of material per unit volume. P = np. where n is number of molecules per unit volume. Displacement vector, D= D is equal to the free charge per unit area or equal to the surface density of free charges, Thus D = q/A = σ (3)