Two charged spheres of charge q and mass m are each hanging from strings and are at equilibrium as shown below:

Give an expression for tanθ in terms of ke (use "k" to write ke), q, m, g (gravity), and d (the distance between the spheres).


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  1. call angle from vertical A and tension in string = T
    m g =

    horizontal components
    F = k q^2/d^2 = T sin A
    vertical components
    m g = T cos A
    T sin A/T cos A= tan A = k q^2/(m g d^2)

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    posted by Damon

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