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Two charges each having magnitude q and ...

Two charges each having magnitude `q` and same polarity are fixed some distance apart.A point charge `Q` is kept on exactly middle of the line joining the two charges.Then equilibrium of `Q` is

A

Stable along the line along perpendicular bisector of the line joining the two charges if Q is of same polarity as that of q

B

Neutral along the line joining the two charges for any polarity of Q

C

Stable along the line joining two charges if charge Q is of opposite polarity to that of q

D

Unstable along the line joining two charges if charge Q is of opposite polarity to that of q

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