Let, we want to calculate the P.E(potential energy) of a system containing 3particles p(adsbygoogle = window.adsbygoogle || []).push({}); _{1},p_{2},p_{3}.the point of observation is P.so now we should add up the P.E at P due to p_{1},p_{2},p_{3}to get the net potential energy of the system,but why we take the P.E of particles due to each other into count instead of the previous method.I can't figure it out.

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# B Calculating the P.E. of a system

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