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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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The correct Answer is:
B
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