ingeneral explain me about DISCHARGE,the phenomenon due to which lightening is caused and ELECTRIC BREAKDOWN, or to put in simple, explain me under what conditions a dielectric could turn into a conductor and why?
Asked by sathish | 24th Apr, 2013, 05:54: PM
t high electric fields, a material that is normally an electrical insulator may begin to conduct electricity i.e. it ceases to act as a dielectric. This phenomenon is known as dielectric breakdown.
For each material, there is a characteristic field strength needed to cause dielectric breakdown. This is referred to as the breakdown field or dielectric strength. Typically values of the dielectric strength lie in the range 106 109 Vm-1. The exact value of the dielectric strength depends on many factors most obviously the size of the energy gap, but also the geometry and microstructure of the sample and the conditions it is subjected to.
Answered by | 25th Apr, 2013, 11:51: AM
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