Dipole moment and polarization, Physics

Assignment Help:

An electrical dipole is just a separation between a negative and positive charge of the same magnitude. Consider that a dielectric material is exposed to an electrical field. The effect of the electric field can be two fold.

(1)It generates electrical dipoles in the material and attempts to align them in the field direction. In other terms with a field dipoles come into being that do not present without a field.

(2)It attempts to align dipoles that are previously present in the material. In other terms the material consists of electric dipoles even with no field.

Of course we also may have a mixture of both effects: The electrical field may alter the distribution of existing dipoles while attempting to align them, and it may create new dipoles additionally. The total effect of an electric field on a dielectric material is called the polarization of the material. To understand this better, let us look at the most simple example we have a single atom. We have a positively charge nucleus and the electron "Cloud". The negative charges associated with the electron cloud can be averaged in space and time. If we now apply an electric field, the centres of charge will be separated. The electron cloud will be dragged in the direction of the positive pole of the field, the nucleus to the negative one. We may visualize that the centre of the positive and negative charges q are now separated by a distance d, and thus a dipole moment p is induced, which is defined by:

                                                         P=q.d

It is important to under that p is a vector because d is a vector.

 


Related Discussions:- Dipole moment and polarization

Classification of dielectric, There are thousands of insulating materials a...

There are thousands of insulating materials available in the market. Insulations technology is one of the few branches where the number of materials is very large. Any special requ

What is atomic models?, What is Atomic Models? The concept of atoms was f...

What is Atomic Models? The concept of atoms was first suggested by the ancient Greeks. The atom was supposed to be the smallest piece of matter. Then J. J. Thompson discovered th

Pressure, a car tyre is pumped up to 230 kPa. What is the volume of air at ...

a car tyre is pumped up to 230 kPa. What is the volume of air at atmospheric pressure (100kPa) that must be pumped into a tyre that has a volume of 0.1 cubic meter?

why the vectors do not divide?, Actually vectors are divisible but not dir...

Actually vectors are divisible but not directly. A vector is multiplied by the inverse of the vector to be divided.In other way, its magnitude an be divided and multiplied by a uni

What is the equation of wavelength, What is the equation of wavelength rela...

What is the equation of wavelength related with a moving particle?

Define about the graphite structure, Define about the Graphite Structure ...

Define about the Graphite Structure   Graphite is the allotropic form of carbon. In case of graphite the carbon atoms are arranged in regular hexagons in flat parallel layers a

Voltage division, Voltage division: In a series circuit Ohm's law appli...

Voltage division: In a series circuit Ohm's law applies for each component.  However, since the current is common to all components we have:           V1 = IR1,  V2 = IR2,

Galvanometer, write principles,construction & working of a moving coil galv...

write principles,construction & working of a moving coil galvanometer

Determine expression for the bound ray, A symmetric, multimode slab wavegui...

A symmetric, multimode slab waveguide has a core width 2ρ, a uniform cladding index n cl and a linear, graded-index profile n(x) in the core that is continuous and symmetric about

What is flux, The rate of flow of energy or particles across a given surfac...

The rate of flow of energy or particles across a given surface.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd