Kanagathara

Dielectrics are

• Conducting materials

• semi conducting materials

• super conducting materials

• insulating materials

The dielectric material is

• copper

• aluminium

• silicon

• mica

Polarisation is

• dipole moment per unit volume

• dipole moment per unit mass

• dipole moment per unit area

• none of the above

The orientational polarisability is

• directly proportional to temperature

• inversely proportional to temperature

• independent of temperature

• none of the above

The common feature between ionic and electronic polarisation is

• both are caused by electronic displacement

• both are strongly dependent on temperature

• both are unaffected by variation in temperature of the dielectric

• both are responsible for infrared absorption of a dielectric

The orientational polarisation

• is independent of temperature

• decrease with increase of temperature

• increase with increase of temperature

• is dependent of temperature

Clausius - Mosotti relation does not hold for

• Liquids

• Gases

• Amorphous solids

• crystalline solids

At low frequencies , the following contributes to total polarisability

• electronic

• ionic

• orientational

• all the above

The direction of the polarisation

• in the direction of the Electric field

• in the opposite direction of the Electric field

• in the direction of dipole moment

• in the direction of displacement

The field due to polarisation of charges on the surface of the spherical cavity of a dielectric is

• P / 3ε₀

• P / 3ε

• P / ε₀

• P / 3ε_r