Polarization in a dielectric on application of electric field is

Displacement / separation of opposite charge centers

Passing of current through dielectric

Excitation of electron to higher energy level

The outer sphere of spherical capacitor is earthed. For increasing its capacitance.

the earthing of the outer sphere is removed

vacuum is created between two spheres

the space between two spheres is increased

dielectric material is filled between the two spheres

If is the polarization vector and is the unit vector normal to the surface then a polarized piece of a dielectric can be regarded as equivalent to

only charges of a surface density

charges of a volume density and surface charges of density ρ b is given by

charges of volume density and surface

The susceptibility of a polar dielectric is temperature dependent because

They are necessarily anisotropic in a nature

Their polarization is mainly caused by the torque due to the external field tending to align their ‘permanent’ dipoles in a direction parallel to the field

Their polarization is mainly caused by the relative separation of the positive charges within the individual molecule by external field

At the boundary or interface between two dielectric media the vector and are such that

The normal component of and normal component of are always the same on each side of the boundary

The tangential component of and the normal component of is same on each side of the boundary. The latter condition is however, valid only in the absence of any free charges on the interface

Tangential component of and normal component of are always the same on each side of the boundary

The behavior of a dielectric is

similar in an electrostatic field and in a varying electric field.

different for static and varying field but is independent of the frequency

different for static and varying field and is very much depend on the frequency

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