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Two charges, each equal to q, are kept at x = – a and x = a on the x-axis. A particle of mass m and charge q 0 = 2 q is placed at the origin. If charge q 0 is given a small displacement (y << a) along the y-axis, the net force acting on the particle is proportional to -

1. y 1
2. – y 1
3. y
4. – y

Correct answer: y

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