Physics - Coulombs Law

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Two identical objects have charges 6.0*10^-6 and -2.0*10^-6 respectively. When placed a distance d apart, their force of attraction is 2.0N If the objects touched together, then moved to a distance of separation of 2d, what will be the new force between them.

Ans: I tried the inverse square law and the coulomb`s law but i do not get the answer.

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