Point charges Q = 1 nC, Q; = -2 nC, Q, = 3 nC, and Q, = -4 nC are posi- %3D tioned one at a time and in that order at (0, 0,0), (1,0,0), (0,0,-1), and (0,0, 1), respectively. Calculate the energy in the system after each charge is positioned.
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