Question

What type of the end the conductor should have for the discharging of corona?
A) Spherical end
B) Flat end
C) Pointed end
D) Concave end

Answer 1

Hint: The type of ends of the conductors should have a high electric field for the discharging of corona. The ionizing radiation produces some free electrons and gets accelerated by the field. When the positive charge is present at tip then it will attract the same amount of positive charge which will make it neutral.

Complete step by step answer:
The electrical discharge due to the ionization of fluid like air surrounding the conductor which carries high voltage. It is the process in which the current flows from electrodes with the potential as high into the neutral fluid.
The corona discharge creates a strong chain reaction for which the electric field should also be strong. Then, the electrons which are present in air collides with atoms which are hard to ionize them. So, more free electrons are produced so that they can ionize more atoms.
The conductors which have pointed ends are required for this phenomenon as the electric field is required for this discharge. Therefore, the conductors having pointed ends have more electric field for the discharging process of corona. Suppose that there are positive charges present at the tip so, it will now attract the same amount of negative charges making it neutral. This is the phenomenon of corona discharge.
Hence, the correct option is (C).

Note: The problems caused by corona discharge are the power loss, audible noise etc. It can also damage the insulation of devices such as capacitors, transformers, generators and motors which can also result in the failure of that device.