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Homework Help: Coulomb's law in 3D

  1. Jun 5, 2017 #1
    1. The problem statement, all variables and given/known data
    q1= 5 x 10^-6C position (1;2,-1)
    q2= -3 x 10^-6 C position (-2,1,3)

    a) what is the electric force caused by q2 on q1? (vector notation)
    b) what is the electric field at (0,0,0)

    2. Relevant equations
    F = kq1q2/r^2
    E= F/q

    3. The attempt at a solution
    I really don't know how to start this problem. Since this problem is in 3D, I don't know how to find the z coordinate of the electric force.

    What I initially did was to find the electric force with Coulomb's law, but it gives me a number and not components. I tried to play with Pythagoras's theorem, but didn't figure anything out.
     
    Last edited: Jun 5, 2017
  2. jcsd
  3. Jun 5, 2017 #2

    cnh1995

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    Welcome to PF!
    You need to provide an attempt. It is mandatory while posting in the homework help section.
     
  4. Jun 5, 2017 #3

    haruspex

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    In terms of the positions P and Q of two charges, what is the line of action of the force between them?
     
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