A 3-phase
line has conductors 2 cm in diameter spaced equilaterally 1 m apart. If the
dielectric strength of air is 30 kV (max) per cm, then the disruptive critical
voltage for the line is __________. (Take air density factor 
and irregularity
factor mo= 0.9
140 kV
150 kV
160 kV
145 kV
145 kV
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