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: Coulombs law problem

  1. Feb 20, 2007 #1
    1. The problem statement, all variables and given/known data

    A charge of -4.1 microC is located at the origin and a charge of -2.98microC is located along the y axis at 2.11519 m.
    The value of the Coulomb constant is 8.99x10^0.
    At what point along the y-axis is the electric field zero? Answer in units of meters.

    2. Relevant equations

    E= F/q


    3. The attempt at a solution

    kq/x^2 = Q/(2.11519-x)^2

    using this, and doing the math i got 1886 something...very incorrect.. Please help:confused:
  2. jcsd
  3. Feb 20, 2007 #2
    1. Both charges produce an electric field.
    2. What will happen to a test charge placed at a position where the electric field is zero?
    3. You should first intuit where the field will be zero. I.E. is it along the negative y axis, between the charges, or past the second charge along the y axis.
    Hope that helps.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook