Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Electrical Properties of Dielectric Materials
The term "Dielectric strength" of a dielectric material means the maximum electric field strength that it can withstand intrinsically without breaking down i.e.; without knowing about failure of its insulating properties. The hypothetical dielectric strength of a material is an intrinsic property of the bulk material and is not dependent on the configuration of the material or the electrodes by which the field is applied. At breakdown, the electric field release bound electrons, converting the material into a conductor. The field strength at which breakdown takes place in a given case is dependent on the respective geometries of the dielectric (insulator) and the electrodes with which the electric field applied; as well as the rate of increase of applied electric field. The dielectric strength is otherwise called as the breakdown voltage. All electrical apparatus are intended to work at particular voltage. If this operating voltage is slowly increased, then at some voltage, the dielectric used in the apparatus gives away. Therefore, the voltage below which the dielectric material remains stable in its property, but above which it result in the destruction of insulating properties is called "Breakdown voltage". In other words dielectric strength is defined as the property of an insulator which enables it to withstand continuous electric stress or the maximum electrical stress which it will successfully withstand. It is expressed in terms of KV/mm or kV/cm under specified conditions.
Factor Affect acting Dielectric structure:
(1)Dielectric strengths decrease with rise of temperature in case of air. In case of liquid insulators the effect with the type of oil and its viscosity.
(2)Humidity generally decreases the value of dielectric strength.
explain the negative result of speciale theory of relativity
A particle with mass m = 2:5 is moving along a straight trajectory. The distance covered by a particle is described by the function S(t) = t 3 + 2t 2 , where t > 0 is the time
Making a sun-dial To withstand all weather, a sun-dial should be form of metal or painted wood. A cardboard model can be formed for easy experiments. The gnomon which casts
Describe about Helium-Neon Laser in short. Helium-Neon Laser: The first gas laser termed as Helium-Neon (He-Ne) laser (one of the illustrations for four level lasers) was co
Draw a schematic diagram of a single optical fibre structure. Describe briefly how an optical fibre is fabricated. Explain in brief, the mechanism of propagation of light signal by
In an isothermal process, the temperature of body always same throughout the process. As the internal energy of a system depends only on its temperature, thus there is no modificat
An iron wire has a cross-sectional area equal to 5.00×10-6m2. Carry out the following steps to determine the drift speed of the conduction electrons in the wire if it carries a cur
Find out which tray will produce ice cubes first? Suppose you have two ice cube trays. One is filled with hot water and the other with cold water. Which tray will produce ice cu
A cheetah can accelerate from rest to a speed of 27.8 m/s in 5.20 s. The cheetah can carry this speed for 9.70 s before it quickly runs out of energy and stops. What distance does
Can we take a negative test charge to find electric field?
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd