1. Not finding help here? Sign up for a free 30min 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!

Coulombs Law

  1. Sep 13, 2008 #1
    1. The problem statement, all variables and given/known data
    Given a cube with equal charges on all corners save one, find the charge on the origin.

    2. Relevant equations
    F = kQ1Q2

    3. The attempt at a solution
    My current idea is splitting up the magnitude of all charges on the origin into their X,Y, and Z components.

    Because all magnitudes are formed with right triangles I can use pythagorean theorem to solve for the components and I get:

    Q1: +1 in the X
    Q2: +1 in the Z
    Q3: +1 in the Y
    Q4: +1 in the X, Z
    Q5: +1 in the X, Y
    Q6: +1 in the Y, Z
    Q7: +1 in the X, Y, Z

    So the sum of the magnitudes acting on the origin would be +4 in all directions, and I have a feeling this is wrong.
  2. jcsd
  3. Sep 14, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Cefari! :smile:

    I don't understand either the question or your answer. :confused:

    Do you mean find the field at the origin?

    If you're adding fields, remember that they're vectors (with a direction), and the strength is 1/distance-squared.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Coulombs Law
  1. Coulomb's law (Replies: 1)

  2. Coulomb's law (Replies: 8)

  3. Coulomb Law (Replies: 1)