A spsrk passes though air when the potential gradient at the surface of a chaged conductor is `3xx10^(6) VM ^(-1)` What must be

A spsrk passes though air when the potential gradient at the surface of a chaged conductor is `3xx10^(6) VM ^(-1)` What must be the radius of a metal sphere (insulated ) which may be raisid to a pottential of `2xx10^(6)` voits before spking occurs? How much energy will be be stored just before there ios a spark?

A spsrk passes though air when the potential gradient at the surface of a chaged conductor is `3xx10^(6) VM ^(-1)` What must be the radius of a metal

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