Discussion
Corona usually occurs when the electrostatic stress in the air around the conductor succeeds:
Answer: A
Corona occurs when the stress exceeds about 30 KV (maximum value)/cm.
The dielectric strength of air at normal temperature and pressure is about 30 kV/cm peak, which is about 21.1 kV/cm rms. When the electric field at the conductor surface exceeds this, the air around it ionises and corona appears.
22 KV (maximum)/cm is close to the rms figure but labelled as a peak, so it understates the breakdown stress. 11 and 6.6 KV (rms)/cm are well below breakdown and are simply common system voltages in kV.
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