Please explain me the difference between the terms-Dielectric;Dielectric constant and Dielectric strength along with their physical significance.

Asked by vivek8312 | 24th May, 2011, 03:34: AM

Expert Answer:

A dielectric material is a substance that is a poor conductor of electricity, but an efficient supporter of electrostatic fields. If the flow of current between opposite electric charge poles is kept to a minimum while the electrostatic lines of flux are not impeded or interrupted, an electrostatic field can store energy. This property is useful in capacitorss, especially at radio frequencies. Dielectric materials are also used in the construction of radio-frequency transmission lines.
 
A dielectric constant is a fundamental property of a material, along with: boiling point, melting point, viscosity, and refractive index. A dielectric constant is a measure of the interaction of an oscillating electric field (an electric field that oscillates between positive and negative at a certain AC frequency) with a molecule. In pure simple compounds, the values of boiling point, melting point, viscosity, and refractive index are strongly influenced by their dielectric constant. We can compare three simple molecules (of approximately the same molecular weight) like lithium fluoride (LiF), ethane (C2H6), and nitrogen (N2) with various physical properties:
 
The dielectric strength of a dielectric is defined as the maximum value of electric field that can b applied to the dielectric without its electric breakdown.

Read more: EE2202-ELECTRO MAGNETIC THEORY - Anna University Engineering Question Bank 4 U http://www.questionbank4u.com/index.php?action=view&listid=434&subject=117&semester=24#ixzz1NCH5gpVb 
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Answered by  | 23rd May, 2011, 10:46: PM

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