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Calculate the EPE of a collection of three particles (7.122x10^1) nC, (1.938x10^1)
nC and (-7.0720x10^1) nC, which are distances of r12 = (3.4430x10^-1) m, r13 =
(6.0320x10^-1) m and r23 = (5.38x10^-1) m respectively.
%3D
%3D
91
r 12
r13
123
q3

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