1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper
    Gold Member

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


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    In terms of the positions P and Q of two charges, what is the line of action of the force between them?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted