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Math Help - Electric Charge Question

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    Electric Charge Question

    Neutral metal sphere A, of mass 0.10 kg, hangs from an insulating wire 2.0 m long. An identical metal sphere B, with charge -q, is brought into contact with sphere A. The spheres repel and settle as shown. Calculate the initial Charge on B.

    Coulomb's Law Formula = kq1q2/r^2



    How do I go about solving this problem? (the book gives 3.9x10^-6C) as the answer)
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    Quote Originally Posted by Jeavus View Post
    Neutral metal sphere A, of mass 0.10 kg, hangs from an insulating wire 2.0 m long. An identical metal sphere B, with charge -q, is brought into contact with sphere A. The spheres repel and settle as shown. Calculate the initial Charge on B.

    Coulomb's Law Formula = kq1q2/r^2



    How do I go about solving this problem? (the book gives 3.9x10^-6C) as the answer)
    I'm curious to see a solution for this, as the only way I can think to do it is by method of images, which I would have thought to be too advanced for High School.

    -Dan
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