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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
\( \mathrm{P} \) \( \mathrm{x} \) along the \( \mathrm{x} \)-axis, is approximately proportional to
(A) \( x \)
(B) \( x^{2} \)
\( (\mathrm{C}) \mathrm{x}^{3} \)
(D) \( 1 / x \)
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