What is orientational polarization derive the relation for orientational polarization in AC field?

Orientational Polarization or dipolar polarization: i.e. orientational Polarizability is inversely proportional to temperature and proportional to the square of the permanent dipole moment.

What is the relation between polarization and electric field?

When a dielectric is placed in an electric field, it acquires a polarization that depends on the field. The electric susceptibility χe relates the polarization to the electric field as P = χeE.

How does orientational polarization depend on temperature?

Generally, in absence of external electric field electric dipoles are so oriented randomly that their net effect becomes zero but in presence of electric field, these dipole try to rotate and align in the direction of electric field. This is known as orientation polarization which is dependent over temperature also.

What are the four polarization mechanisms?

There are fundamentally four divisions of polarization mechanisms. They are Electronic polarization, dipolar or Orientation polarization, Ionic polarization and Interfacial polarization. Let us discuss the different polarization in detail.

How does molecular orientation affect Polarizability?

The relationship between polarizability and the factors of electron density, atomic radii, and molecular orientation is as follows: The greater the number of electrons, the less control the nuclear charge has on charge distribution, and thus the increased polarizability of the atom.

What are the two opposing energies involved in Polarisation of a dielectric material?

This alignment when summed up over all the molecules leads to a net dipole moment in the direction of the electric field. The extent to which the polar molecules get polarizes and align themselves is related to two factors; the strength of the external field and the thermal energy that breaks this alignment.

What is the dimensional formula of polarization?

[L−2T1A1]

Which polarization is inversely proportional to the temperature?

Orientational polarization is inversely proportional to temperature and proportional to the square of the permanent dipole moment.

Which type of polarization depends on the temperature?

orientational polarisation
Explanation: The electronic, ionic and interfacial polarisation depends on the atoms which are independent with respect to temperature. Only the orientational polarisation is dependent on the temperature and is inversely proportional to it.

What are different types of polarizations?

Types of Polarization

• Linear polarization.
• Circular polarization.
• Elliptical polarization.

What is the effect of polarization on the capacitance of capacitor?

(a) The molecules in the insulating material between the plates of a capacitor are polarized by the charged plates. This produces a layer of opposite charge on the surface of the dielectric that attracts more charge onto the plate, increasing its capacitance.

What are the factors affecting the polarizability of a molecule?

The factors which are responsible for Polarizability can be: Molecular size and the number of electrons. Now how can we say that molecular size affects Polarizability so the answer is: on increasing the atomic size, Polarizability also increases, that means molecular size is directly proportional to Polarizability.

What is orientational polarization?

The process of orientation of permanent dipole moments along the axis of applied electric field is called orientational polarization. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering.

What is orientation polarization in polar dielectric materials?

In polar dielectric materials, positive and negative charges do not coincide with in the molecule. Hence they possess permanent dipole moment. When polar dielectrics are subjected to electric field, dipoles tend to get oriented in the direction of applied field. This phenomenon is called Orientational polarization.

What is the mechanism of Dipole polarization?

Polarization is actually the alignment of the dipole moments of the fixed or induced dipole in the direction of the peripheral electric field. The mechanism of polarization deals with how a molecule or atom is reacting to a peripheral electric field. Simply we can say that it leads to the positioning of dipoles.

How is Lorentz force balanced in polarisation?

In the case of electronic and ionic polarization, Lorentz force is balanced by restoring force and coulomb attractive force, but for orientational polarization dipole moment is due to thermal agitation of the molecules. This polarization occurs with the accumulation of charges with opposite polarity near the electrons.