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The magnitude of the electric force between two obejcts with charge 
and 
is given by Coulomb's law:
where
is the Coulomb's constant
and r is the distance between the two objects.
In our problem, the distance is
, while the magnitudes of the two charges are
(we can neglect the sign of the second charge, since we are interested only in the magnitude of the force).
So, using the formula and the data of the problem, we find
where
and r is the distance between the two objects.
In our problem, the distance is
(we can neglect the sign of the second charge, since we are interested only in the magnitude of the force).
So, using the formula and the data of the problem, we find