Oscillations of a triatomic molecule

Consider the following model of a triatomic molecule: Three point-charges with charge qq and mass mm are connected by massless rigid rods of length ll. Clearly, the molecule is in equilibrium when the charges are aligned. Since this equilibrium is stable, the molecule can oscillate as shown in the figure. If the parameters qq, mm, and ll satisfy kq2ml3=104 s2wherek=14πϵ0, \frac{k q^{2}}{m l^{3}}=10^{4}~\mbox{s}^{-2} \quad \textrm{where} \quad k=\frac{1}{4\pi \epsilon_{0}}, find the period TT in seconds of small oscillations.

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