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Determine the electrostatic potential energy of a system consisting of two charges $7 \mu C$ and $2 \mu C$ (and with no external field) placed at $(– 9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively.

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(A) -0.7J
Hence A is the correct answer.
answered Jun 11, 2014 by meena.p
 

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