Two point charges each of magnitude \( Q \) are placed at coordinates \( (0, y) \) and \( (0,-y)...

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Two point charges each of magnitude \( Q \) are placed at coordinates \( (0, y) \) and \( (0,-y) \). A point charge \( q \) of the same polarity can move along \( X \)-axis. Then :
(A) The force on \( q \) is maximum at \( x=\pm y / \sqrt{2} \)
(B) The charge \( q \) is in equilibrium at the origin
(C) The charge \( q \) performs an oscillatory motion about the origin
(D) For any position of \( q \) other then origin the force is directed away from origin
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