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

Electricity., what should be the length of a nichrome wire of resistance 45...

what should be the length of a nichrome wire of resistance 45 ohms if the length of a similar wire is 60 cm and resistance is 25 ohms

Dimensions, find the dimensions of the following i.power ii.velocity iii.fo...

find the dimensions of the following i.power ii.velocity iii.force

Spontaneity of a chemical reaction, How could you predict the spontaneity o...

How could you predict the spontaneity of a chemical reaction, given changes in entropy and enthalpy?

Complex variables and rlc circuits, Research the topic of RLC circuits with...

Research the topic of RLC circuits with AC sources. Explain what is given in a general problem involving a circuit and what is asked for. Explain the terms which comprise an RLC ci

Find total capacity of each container, Containers in Illustrations C and D ...

Containers in Illustrations C and D are identical Each container is 3.25'w x 3.25'w  x 8.4'l Total capacity of each container 88.725 cubic feet Each container is filled wi

Properties of semi-conductors, Their conductivity lies between conductor an...

Their conductivity lies between conductor and insulator. Their resistivity is usually high and temperature coefficient of resistance is always negative. These are materials which a

Types of bond: ionic bond, IONIC BOND Ionic bonding involves the transf...

IONIC BOND Ionic bonding involves the transfer of electrons from an electropositive atom (an atom that tends to "donate" an electron) to an electronegative atom (an atom that t

What is non-inertial frame of reference, NON-INERTIAL FRAME OF REFERENCE: ...

NON-INERTIAL FRAME OF REFERENCE: A frame which has non-uniform motion but particular acceleration is known as non-inertial frame of reference. Newton's first law of motion i

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