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Two equal point charges are fixed at x=-...

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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