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The dielectric constant measures how strongly the eletronic charge in the material can adjust to shield an external electric field, larger the dieletric constant, more effective is the screening. But for the electronic charge be able to adjust responding to the electric field, the electrons should be easily moved, which means that each electronic state will change assuming a polarized configuration. If the gap is large, the electric field can not mix the electronic states in the valence band with the electronic states in the conduction band, (think of perturbation theory, where the denominator will be of order of the band gap energy) so the electrons don't polarize much and the dielectric constant is small. On the other hand, in a metal, where the gap is zero, any small electric field mix the occupied states with the unoccupied ones, and we have a strong screening. The dielectric constant measures how strongly the eletronic charge in the material can adjust to shield an external electric field, larger the dieletric constant, more effective is the screening. But for the electronic charge be able to adjust responding to the electric field, the electrons should be easily moved, which means that each electronic state will change assuming a polarized configuration. If the gap is large, the electric field can not mix the electronic states in the valence band with the electronic states in the conduction band, (think of perturbation theory, where the denominator will be of order of the band gap energy) so the electrons don't polarize much and the dielectric constant is small. On the other hand, in a metal, where the gap is zero, any small electric field mix the occupied states with the unoccupied ones, and we have a strong screening.
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What is dielectric constant?
A dielectric is an insulating material that does not conduct electricity and is transparent to an electromagnetic field. Dielectric materials are used to separate conducting surfaces such as the plates inside a capacitor, wires inside transformers, electric cable conductors, and elsewhere in the electric industry where electrical separation of charged elements is necessary. The dielectric constant is a ratio of the capacitance of a capacitor in which a particular insulating material is the dielectric, to the capacitance of the capacitor in which a vacuum is the dielectric.
What is the difference between power semiconductors and semiconductors?
power semiconductorspower semiconductors can drive large currents during forward biassemiconductorsemiconductors drive small currents during forward bias
Statement best describes the design of the dumbbell building?
It was two large buildings connected by a narrow stairway
What statement best describes the design of the dumbbell buildings?
It was two large buildings connected by a narrow stairway
Why are dams built as part of large hydro power plants?
To gain a constant source of water.
Why do polar substance have a high dielectric constant?
Water, due to its polar nature, has a large dielectric constant. Therefore, water molecule has a very large electric dipole moment and is forced to rotate to respond to an alternate external electric field. Hence water as a liquid has a very large dielectric constant i.e. 80. Mica on the other hand is less polar as water and hence has low dielectric constant.
What is the relation between Dipole moment and Dielectric constant?
The dipole moment is a measure of the overall polarity of a molecule due to the separation of positive and negative charges. The dielectric constant is a measure of how well a material can insulate electric fields, which is influenced by the presence of dipoles in the material. Generally, materials with higher dipole moments tend to have higher dielectric constants.
Why do sodium ions and chloride ions remain dissociated in the blood?
Blood has a sufficiently high proportion of water to have a large enough dielectric constant to promote the dissociation of the ions.
What is dielectric constant?
A dielectric is an insulating material that does not conduct electricity and is transparent to an electromagnetic field. Dielectric materials are used to separate conducting surfaces such as the plates inside a capacitor, wires inside transformers, electric cable conductors, and elsewhere in the electric industry where electrical separation of charged elements is necessary. The dielectric constant is a ratio of the capacitance of a capacitor in which a particular insulating material is the dielectric, to the capacitance of the capacitor in which a vacuum is the dielectric.
What is the difference between power semiconductors and semiconductors?
power semiconductorspower semiconductors can drive large currents during forward biassemiconductorsemiconductors drive small currents during forward bias
Why minority carriers in P-type is electrons?
The P-type semiconductors have a very large percentage of holes.
What is a narrow stripe of land that connects 2 large bodies of water?
A narrow stripe of land that connects 2 large bodies of water is an isthmus.
What oil is used in a Submersible pump?
It's a special dielectric oil. -Almost impossible to get unless in large quantities now.
What a narrow channel connecting two large bodies of water?
it is a straight.
How come dragons have large butts?
They don't. They have rather narrow pelvis'
A narrow strip of land that connects two large area of land?
The narrow strip of land that will connect 2 large areas of land is called an isthmus. Many isthmuses have water on either side.
Do Jimmy Choo shoes run narrow?
No- I own a pair and have narrow feet. They fall off the back of my foot- they are so large in the heel.
