The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density λ are kept parallel to each other. In their resulting electric field, point charges q and –q are kept in equilibrium between them. The point charges are confined to move in the x-direction only. If they are given a small displacement about their equilibrium positions, then the correct statement (s) is (are)
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As +q is displaced towards right, the repulsion of right side wire will dominate and the net force on +q will be towards left, and vice versa
F restoring = q 
F restoring = 
Hence SHM
For –q, as it is displaced towards right the attraction of right side wire will dominate, which forces the –q charge to move in the same direction of displacement similarity for other side
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