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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 \( q_{0}=\frac{q}{2} \) is placed at
\( \mathrm{P} \) the origin. If charge \( q_{0} \) is given a small displacement

W \( y(ya) \) along the \( y \)-axis, the net force acting on the particle is proportional to
(2013 Main)
(a) \( y \)
(b) \( -y \)
(c) \( \frac{1}{y} \)
(d) \( -\frac{1}{y} \)
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