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Two small spheres each of mass m kg and...

Two small spheres each of mass `m` kg and charge `q` coulomb are suspended from a point by insulating threads each of `l ` length, but of negligible mass. If `theta` is the angle which each string makes with the vertical vertical when equilibrium has been reached, show that
`q^(2) = 4mg l^(2) sin^(2) theta tan theta (4pi in_(0))`

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