Two equal negative charges ‘-q’ are fixed at points (0, -a) and (0, a) on y-axis. A positive charge ‘Q’ is released from rest at the point (2a, 0) on the x-axis. The charge ‘Q’ will
If ‘Q’ is released from a point not very for from the origin on x-axis, only then motion is simple harmonic. The motion will be periodic but not simple harmonic otherwise.