If the distance between two spherical charged objects increases by a factor of two, then the electrical force between the objects

a repulsive electrical force. ... postulates that an electric field surrounds each charged object. If the distance between two spherical charged objects increases by a factor of two, then the electrical force between the objects. decreases by a factor of four.

Explanation: does this help

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force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach