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Two charges, each equal to q, aer kept a...

Two charges, each equal to q, aer kept at `x=-a` and `x=a` on the x-axis. A particle of mass m and charge `q_0=q/2` is placed at the origin. If charge `q_0` is given a small displacement (ylt lt a) along the y-axis, the net force acting on the particle is proportional to

A

y

B

`-y`

C

`(1)/(y)`

D

`-(1)/(y)`

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The correct Answer is:
B
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