Frequency dependence of dielectric constant, Physics

Assignment Help:

Electrons have very much smaller mass than that of ions, so they respond more rapidly to a changing electric field. For electric field that oscillates at extremely high frequencies (like light) only electronic polarization can takes place. At lesser frequencies, the relative displacement of positive and negative ions can takes place. Orientation of permanent dipoles, which require the rotation of a molecule can occur only if the oscillation is relatively show (MHz range or slower). The total polarization P, total polarizability and the relative permittivity of a dielectric in an alternating field all depend on the ease with which the dipoles can reverse alignment with each other reversal of the field. Some polarizability mechanisms do not permit sufficiently rapid reversal of the dipole alignment. In such a process the time required to reach the equilibrium orientation is called the relaxation time and its reciprocal the relaxation frequency. It can be also defined as the time specific polarization to occur is called the relaxation time. When the frequency of the applied field exceeds that of the relaxation frequency of a particular polarization process, the dipoles cannot reorient fast enough and operation of the process ceases. 


Related Discussions:- Frequency dependence of dielectric constant

Impact of electron energy, Plot the Bremsstrahlung emitted (intensity vs en...

Plot the Bremsstrahlung emitted (intensity vs energy) from a copper target for (i) both 15 keV and 30 keV electrons, (ii) for 15 keV electrons at both 10 and 50 mA current and (iii

Bug on a bowling ball, Bug on a Bowling Ball A bug sitting on top of a ...

Bug on a Bowling Ball A bug sitting on top of a bowling ball begins to slide o? with negligible friction. Conclude the angle at which the bug leaves the surface. This proble

What is the dimentional formula of plank''s constant?, The dimentional for...

The dimentional formula of  plank;s constant ML 2 T -1

How is a wave front dissimilar from a ray, How is a wave front dissimilar f...

How is a wave front dissimilar from a ray ? Draw the geometrical, shape of the wave fronts when (i) light diverges from a point source, and (ii) light emerges out of a convex le

How many amps of current in 150-watt 120 volt light bulb, Used normally, a ...

Used normally, a 150-watt, 120 volt light bulb requires how many amps of current? Ans: Used generally, a 150-watt, 120 volt light bulb needs 1.25 amps.

Compute the cross-sectional area, Assigned homework a. The objective of ...

Assigned homework a. The objective of this problem is to get a sense of the tradeoff between cross-section and stiffness for beam structural member. Consider a beam that is 1 me

Electrostatics , Y the charge n voltage. Remain constant ven we connect cap...

Y the charge n voltage. Remain constant ven we connect capacitors in series. N parallel. Respectively??

Increased speed by using a pulley, Using a pulley Use the pulley set-up...

Using a pulley Use the pulley set-up shown in experiment A 12. Apply the force on the movable pulley and get how rapidly the weight on the other end of the string rises.

Motion on inclined plane, a body is thrown horizontally with a velocity of ...

a body is thrown horizontally with a velocity of u from the top of a tower. the displacement of the stone when the horizontal and vertical velocities are equal is

Heat, what is expansion of solids

what is expansion of solids

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