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breakdown potential of the ball




Hi All,

Tesla in "My inventions" autobiography (below the picture of spark 

discharge from the ball) for brekdown potential of the ball give the 
following equation: 

V = 75 400 x r
where (V) is a breakdown potential in volts, (r) is a radius of the ball 
in cm.

1.) Is this corect equation ?
2.) How can we calculate breakdown potential of the toroid ?

Thanks,
Tuky