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Homework Help: SPH4U University Grade 12 Physics - Coulomb's Law?

  1. Apr 8, 2012 #1
    1. The problem statement, all variables and given/known data

    SPH4U University Grade 12 Physics - Coulomb's Law?
    I have to determine the answer using Coulomb's Law. Please help me figure out how to do this !

    Three point charges, q₁= -5.00 μC, q₂= -4.00 μC, and q₃ which is negative are arranged as shown on three corner of side a=0.500 m. The direction of the forces on qt is at +20.0° with respect to the + x axis.
    Calculate the magnitude of q₃

    2. Relevant equations

    Coulomb's Law

    3. The attempt at a solution

    I don't even know how to start :confused:
  2. jcsd
  3. Apr 9, 2012 #2
    Can you attach a picture or describe how q1 and q2 are situated?
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