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Homework Help: Need help - about Coulomb's Law and SHM

  1. Nov 23, 2006 #1
    need help -- about Coulomb's Law and SHM

    Two positive charges +Q are held fixed a distance d apart.
    A particle of negative chage -q and mass m is placed midway between them, then is given a small displacement perpendicular to the line joining them and released. Show that the particle describes simple harmonic motion and find the period.
    ----------------------------
    i've found that the net force acting on the -q is
    F = - (qQd) / [4(pai)(z)(y^2 + (0.5d)^2)]^(3/2) = ma
    where z is the permittivity, and y is the displacement of -q

    how i can show that a = - w^2 y?
     
  2. jcsd
  3. Nov 23, 2006 #2

    dextercioby

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    Science Advisor
    Homework Helper

    Well, you need to redo the calculation of the total net force.

    Daniel.
     
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