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Two indentical pith balls, each carrying...

Two indentical pith balls, each carrying charge q, are suspended from a common point by two strings of equal length l. Find the mass of each ball if the angle between the strings is `2theta` in equilibrium.

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`Tcostheta=(mg), Tsintheta=F_e `
` Then, tantheta =F_e/(mg) `
` F_e=(1) /(4piepsilon_0)q^2/(2lsintheta)^2 `
` :. m=(q^2cottheta)/(16piepsilon_0gl^2sin^2theta)`.
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