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:
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(b, d)
(i) From diagram, force on Q at general position x, is given by
F net = – 2F cosθ = – 
(Towards origin)
(ii) When charge moves from (2a, 0) to origin O, force keeps on acting on Q and becomes zero at O.
∴ Velocity of Q is max. at O.
(iii) Motion is SHM for very small displacements. & 2a is not very small os motion is periodic but not SHM.
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