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Two particles of the same mass m are sus...

Two particles of the same mass m are suspended through strings of equal length l in such a manner that points of suspension are distance d apart. Both particles carry charges of same magnitude but of opposite polarity. Calculate the magnitude of charge if strings make an angle `theta` with the vertical.

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`((4piepsilon_0 mg (d-2l sin theta)^2 sin theta)/(cos theta ))`
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