Question

What are some causes of corona discharge?

1) High voltage power lines
2) Sharp points or edges on conductors
3) Air pollution
4) All of the above
5) None of the above

Answer 1

Corona discharge is caused by high voltage power lines, sharp points or edges on conductors, and air pollution, all of which contribute to an increase in the electric field strength leading to ionization of the surrounding air.

Step-by-step explanation:

Corona discharge can be caused by multiple factors that increase the electric field strength around a conductor to a point where the surrounding air becomes ionized. The causes include:

1. High voltage power lines which can create a large electric field if the voltage is sufficiently high.
2. Conductors with sharp points or edges, where excess charges can become concentrated, creating stronger localized electric fields that facilitate discharge.
3. Air pollution which can contain particles that promote ionization at lower electric fields compared to clean air.

Therefore, the correct answer is 4) All of the above.