Answer to Question #132644 in Optics for manju

Question

2.The relation between electric displacement vector (D), Electric field (E) and Polarization (P)?

Answer 1

solution:-

when we place slab of any material in presence of electric field E then by this external electric field the inner charges are start to rearrange in the direction of field or polarization P is produced.in this can case the Displacement vector D can be represented as below

$D=\epsilon_0E+P$

where $\epsilon_0$ is a constant which is called permittivity of vacuum.