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Hi there, I've been trying this question quite long but I do not get the answer, could anyone help me?

For part one, i got the answer....

part (ii) .... i saw it in a book saying i suppose to choose a point to get the potential energy, lets say i choose point A, the total potential energy of the system would be, U(AB) + U (AD) + U (AC) ... but i couldn't get the answer...did i do it wrong ? do help me, thank you.

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# Homework Help: Problems on Electrostatic

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