The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density 
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)
Text Solution
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In Case I :
Hence +q, charge will performs SHM with time period 
In case II: Resultant force will act along the direction of displacement
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