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Charges \( -q \) and \( +q \) located at \( A \) and \( B \), respectively, constitute an electric dipole. Distance \( A B=2 a, O \) is
\( \mathrm{P} \) the mid point of the dipole and \( O P \) is perpendicular

W to \( A B \). A charge \( Q \) is placed at \( P \) where \( O P=y \) and \( y2 a \). The charge \( Q \) experiences an electrostatic force \( F \). If \( Q \) is now moved along the equatorial line to \( P^{\prime} \) such that the \( O P^{\prime}=\left(\frac{y}{3}\right) \), force on \( Q \) will be close to \( \left(\frac{y}{3}2 a\right) \)
(a) \( 27 F \)
(b) \( 3 F \)
(c) \( \frac{F}{3} \)
(d) \( 9 F \)
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