A point charge q1 is held stationary at the origin. A second charge q2 is placed at point a, and the electric potential energy of the pair of charges is +5.4 X 10-8 J. When the second charge is moved to point b, the electric force on the charge does -1.9 X 10-8 J of work. What is the electric potential energy of the pair of charges when the second charge is at point b?
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