Q. Corona usually occurs when the electrostatic stress in the air around the conductor exceeds (Solved)
1. 32 kV (maximum values)/cm
2. 22 kV (maximum value)/cm
3. 11 kV (rms value)/cm
4. 6.6 kV (rms value)/cm
5. None of the above
- a. 32 kV (maximum values)/cm