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Question

A point charge q1, is held stationary at the origin. A second charge q2 is placed at a point a, and the electric potential energy of the pair of charges is 6.4×108J. When the second charge is moved to point b, the electric force on the charge does 4.2×108J of work. What is the electric potential energy of the pair of charges when the second charge is at point b?

A
8×108J
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B
10.6×108J
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C
16×108J
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D
12×108J
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