00:01
Hello students, when a neutral dielectric material is placed in an external electric field, the electric field i .e.
00:08
The electric dipole in the material align themselves with the field resulting in polarization.
00:29
So, polarization doesn't evolve the creation of new charge but evolve the movement of charges within the material.
00:55
Therefore, the total charge of the dielectric material will be equal to zero.
01:14
So, here let's consider gb is a bound volume charge density and p is a polarization vector.
01:22
Therefore, we can write gb is equal to minus delta p where this del is a divergence of operator.
01:31
Therefore, we can write qb is equal to integral gb into dv using the divergence theorem.
01:42
Therefore, we can also write qb is equal to surface integral p dot ds where ds is the outward normal vector to the surface.
01:53
So, when dielectric is placed in an external electric field, polarization aligns with the field hence electric dipole moment enclosed by the surface s becomes zero...