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!

Coulomb's Law (Finding magnitude & direction of net force)

  1. Jan 25, 2012 #1
    1. The problem statement, all variables and given/known data

    Three positive particles of equal charge, +11.5 µC, are located at the corners of an equilateral triangle of side d = 13.0 cm (Fig. 16-50).

    Calculate the magnitude and direction of the net force on each particle.

    Image is here: http://www.webassign.net/giancoli5/16-38alt.gif


    2. Relevant equations

    k*|q1||q2| / r2



    3. The attempt at a solution

    Solving for net force on Q1:
    Ok, I drew a free body diagram. The force from q2 goes up and to right, q3 goes up and to left. I thought that since the x values will be the same due to symmetry, I could cancel them out and solve for the y value.

    So, I can find one force and multiply by two since they will be the same.

    I did 2 * { (9e9 * 11.5e-6 * 11.5e-6)/132 } * sin60

    I multiplied by sin60 to get the y value.

    My answer is coming out to be .0122, which is wrong. I'm not sure what I'm doing wrong. Can someone please explain? Thanks!
     
  2. jcsd
  3. Jan 26, 2012 #2
    Check your units for d! :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Coulomb's Law (Finding magnitude & direction of net force)
Loading...