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Expression for the change in potential energy of charges

  1. Nov 14, 2008 #1
    1. The problem statement, all variables and given/known data
    Three identical 1nC charges are held at the vertices of an equilateral triangle of side 1cm. If the charges are released simultaneously what is the speed of these charges when they are sufficiently farther apart?

    A. Write an expression for the change in potential energy

    B. Write an expression for the change in kinetic energy

    C. Use the mechanical energy conservation principle to find the speed of the charges.

    2. Relevant equations

    3. The attempt at a solution

    A. (1/2mvq)^2 = E(Va-Vb) + (1/2mVA^2)
    B. DeltaK=1/2m(VB^2-VA)^2
    C. VB = (2(e/m)(Va-Vb) + Va^2)^(1/2)
  2. jcsd
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