The dielectric strength of rubber is 40000 V/mm at frequency of 50 Hz. What is the thickness of insulation required on an electrical conductor at 33 kV to sustain the breakdown

The dielectric strength of rubber is 40000 V/mm at frequency of 50 Hz.

1.	The dielectric strength of rubber is 40000 V/mm at frequency of 50 Hz. What is the thickness of insulation required on an electrical conductor at 33 kV to sustain the breakdown
A.	0.83 mm
B.	8.3 mm
C.	8.3 cm
D.	0.083 mm
Answer» B. 8.3 mm