What is frequency dependence of polarization?
What is frequency dependence of polarization?
When measurements are carried out as a function of frequency, the space charge polarization ceases after a certain frequency and the dielectric constant becomes frequency independent. The frequency beyond which the variation ceases may fall in the certain range.
Is electronic polarization temperature dependent?
Here when the external field is applied, the electron clouds of an atom are displaced with. Respect to the heavy nuclei within the dimensions of the atom. This is called electronic polarization. It does not depend on temperature.
What is polarization How does it depend on electric field?
Polarization occurs when an electric field distorts the negative cloud of electrons around positive atomic nuclei in a direction opposite the field. This slight separation of charge makes one side of the atom somewhat positive and the opposite side somewhat negative.
What is the effect of electric polarization?
The physical properties of materials When stress is applied to certain materials an electric polarization is produced proportional to the stress applied. This is the well-known piezoelectric effect. Conversely, dilatation occurs on application of an electric field.
On what factors frequency depends?
The actual frequency is dependent upon the properties of the material the object is made of (this affects the speed of the wave) and the length of the material (this affects the wavelength of the wave).
How does frequency affect dielectric constant?
Dielectric constant of a material changes with frequency. In general, as frequency increases, the material’s net polarisation drops as each polarisation mechanism ceases to contribute, and hence its dielectric constant drops.
Which of the following polarization is dependent on temperature and frequency?
Orientational Polarizability
Which category of polarizability strongly depends on Temperature and frequency? Explanation: Orientational Polarizability exhibits strong dependence on both frequency and temperature while the electronic and ionic components are nearly independent of temperature and frequency.
Which type of polarization depends upon temperature?
orientational polarisation
Identify which type of polarisation depends on temperature. 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 is the other name of electronic polarization?
If one has to define electric polarisation, it can be said that electric polarization (or polarization density or just polarization) is a vector field that defines the density of permanent or induced electric dipole moments in a dielectric material.
Which type of polarization is temperature dependent?
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 is the relation between electronic polarizability and electric susceptibility?
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.
Does frequency depend?
What determines the natural frequency of a body?
Solution : Natural frequency of a body is determined by (i) Elastic properties of the material of the body.
Why is dielectric constant frequency dependent?
The dielectric constant depends on various factors such as temperature, intensity and frequency of electric field, humidity, radiation effect, mechanical stress etc. The dielectric constant increased with the increasing film thickness, while the dielectric loss can show a non-monotonous variation.
What are differences between electronic polarization and ionic polarization?
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| Sr.No. | Ionic polarization |
|---|---|
| 1 | Ionic polarization describes the net effect of changing the distance between neighbouring ions in an ionic crystal like NaCl (or in crystals with some ionic component like SiO2) by the electric field. |
| 2 | Polarization is linked to bonding strength, i.e. Young’s modulus Y |
Which type of polarization is slower than ionic polarization and occurs at electrical frequency range?
The ionic polarization is due to the displacement of cation and anions when an electric field is applied to a dielectric material. The ionic polarization occurs in ionic solids. Ionic polarization is slower than electronic polarization.