Initially three charges are placed on the x-axis as follows: +1.0 μC at x = 0.0 cm, -1.0 μC at x = 1.0 cm, and +2.0 µC at x = 2.0 cm. The positions of the -1.0 μC and +2.0 μC charges are interchanged. What is the change in the potential energy, Uf - Ui? Express your answer in J, to at least one digit after the decimal point.
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