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[" 51/ Two equal point charges are fixed...

[" 51/ Two equal point charges are fixed at "x=-a" and "],[x=a" on the "x" -axis.Another point charge "Q" is "],[" placed at the origin.The change in the electrical "],[" potential energy of "Q," when it is displaced by a "],[" small distance "x" along the "x" -axis,is "],[" approximately proportional to : "],[[" (a) "x," (b) "x^(2)],[" (c) "x^(3)," (d) "1/x]]

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