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How far from a -7.20 C point charge must a +2.10 C point charge be placed in order for the electric potential energy of the

How far from a -7.20 C point charge must a +2.10 C point charge be placed in order for the electric potential energy of the pair of charges to be -0.600 J? (Take the energy to be zero when the charges are infinitely far apart.)

Express your answer with the appropriate units.

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