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: Help with physics question

  1. Jul 29, 2011 #1
    Help with coulumbs Law!!!

    1. The problem statement, all variables and given/known data

    Consider two point charges located on the x axis: one charge, = -10.0 C, is located at = -1.700m ; the second charge, = 30.5C , is at the origin .

    What is the net force exerted by these two charges on a third charge = 52.5C placed between and at = -1.055m ?

    Your answer may be positive or negative, depending on the direction of the force.

    2. Relevant equations

    Coulomb's law

    3. The attempt at a solution

    first i found,
    F(1on3)=k*10*10^-9*30.5*10^-9/.645^2 then,

    then i added them , but i am gettin the wrong answer d answer shud be -2.43*10^-5 N

    can u tell me whats wrong with my working :)
    Last edited: Jul 29, 2011
  2. jcsd
  3. Jul 29, 2011 #2
    the charge is in nC
  4. Jul 30, 2011 #3
    Look at the charges you're using on F(2on3)
  5. Jul 30, 2011 #4
    oh i see thnks :)
    Last edited: Jul 30, 2011
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook