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Homework Help: 3 point charges on the vertices of an equilateral triangle

  1. Nov 5, 2009 #1
    1. The problem statement, all variables and given/known data

    3 equal point charges on the vertices of a triangle. If the each of the charges are doubled, why is the resulting force on each charge quadrupled?

    2. Relevant equations

    F= Fx +Fy

    F= kqk2/r^2

    3. The attempt at a solution
    I got doubled
  2. jcsd
  3. Nov 5, 2009 #2
    well the force acting on charged particle (Coulomb's law) is equal to:
    [tex] F=k\frac{q_1 q_2}{r^2} [/tex]
    if distance is left same, and charges is doubled, you get:
    [tex] F=k\frac{2q_1 2q_2}{r^2}=4k\frac{q_1 q_2}{r^2}[/tex]
    so the force is bigger four times
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