1. In a concentric spherical electrode system, the outer radius is 400 cm, the breakdown strength of air is 30KV/em and the applied voltage is 300kV. Caleulate the internal radius of the two points (A and B) corresponding to this voltage on the breakdown curve of the system. Comment on the discharge phenomenon for both arrangements. (25 pts) 3000 2700 2400 2100 1800 1500 1200 900 600 300 100 200 300 400 (em)
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