Q 1211880720.     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^2`

B

`1/x`

C

`x^3`

D

None of these.

HINT

Find change in potential energy.

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