Why is corona not observed in a uniform field?
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A corona discharge is an electrical discharge that is brought on by the ionization of a fluid such as air surrounding a conductor which is electrically charged. Spontaneous corona discharges occur naturally in high-voltage systems unless care is taken to limit the electric field strength.
Corona discharges occur only when the critical value of Pressure (Pc) is greater than the normal pressure of the field. In this situation, the estimated breakdown voltage is found to coincide with the inception voltage of the corona discharge, with the actual breakdown occurring at a higher voltage.
So, corona discharges cannot be observed in a uniform field with uniform pressure and voltage.
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