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Two small particles charged with equal p...

Two small particles charged with equal positive charges Q each, are fixed apart at a distance 2a. Another small particle having a charge q lies midway between the fixed charges. Show that
(i) For small displacement (relative to a) along line joining the fixed charges, the middle charge executes SHM'if it is +ve and
(ii) For small lateral displacement, it executes SHM ifit is-ve. Compare the frequencies of oscillation in the two cases

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