A spark passes though air when the potential gradient is `3xx10^(6)` volts per metre what must be the radious of an isoated metal sphere which can be
A spark passes though air when the potential gradient is `3xx10^(6)` volts per metre what must be the radious of an isoated metal sphere which can be changed to a potentiial of 3 million voilts before there are sparks in the air?
`["Hint":E= (Q)/(4piepsi_(0)r^(2))and V=(Q)/(4piepsi_(o)r), thereforeE=(V)/(r)]`
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