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Homework Help: Finding where Magnetic Fields = 0

  1. Jan 28, 2009 #1
    1. The problem statement, all variables and given/known data
    Two point charges, -520x10-6C and -270x10-6C are 2 meters apart. At which point would a carbon nucleus experience zero net force?
    (positive test charge)

    2. Relevant equations
    F=k((q1*q2)/r2) Coulomb's Law

    3. The attempt at a solution
    I really don't understand the method to solving the problem. A simply outline of what to find and then how to manipulate the equations to get the distance would really help me solve this. Fiddling has gotten me nowhere.

  2. jcsd
  3. Jan 28, 2009 #2


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    Homework Helper

    There are 2 forces acting on the test charge.

    Where the forces are equal ...

    If that point is X meters from one charge then it must be 2 - X from the other.

    Just a little bit of algebra should give you what you need.

    Btw: This has nothing to do with magnetism.
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