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Four point charges are placed along x-axis: q1 = 6 nC at x 3 cm, q= 4 nC at x = -2 cm, qs= 5 nC
at x 1 cm and q=3 nC at x = -4 cm. Calculate the total potential energy associated if we put a
fifth charge, qs= 2 nC at x = 0 cm. (Illustrate the problem first before solving.)

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