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# A small charged particle of mass m and charge q is suspended by an insulated thread in front of a very large conducting charged sheet of surface density of charge $\sigma$.The angle made by the thread with the vertical in equilibrium is

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The angle made by the thread with the vertical in equilibrium is $\tan ^ {-1} \bigg( \large\frac{\sigma q}{2 \in _0 mg} \bigg)$
Hence A is the correct answer.
answered May 30, 2014 by