Two charges q 1 and q 2 are placed 30 cm apart, as shown in the figure. A third charge q 3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is q 3 4 0 k , where k is –

1. A. 8q 2
2. B. 6q 2
3. C. 8q 1
4. D. 6q 1

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