Two equal negative charges $-\, q$ each are fixed at the points $(0, a)$ and $(0, -a)$ on the $Y$ -axis. A positive charge $Q$ is released from rest at the point $(2a, 0)$ on the $X$ -axis. The charge $Q$ will :-

  • A

    execute simple harmonic motion about the origin

  • B

    move to the origin and remains at rest

  • C

    move to infinity

  • D

    execute oscillatory but not simple harmonic motion

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