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!

Electrostatic forces/fields

  1. Oct 31, 2011 #1
    1. The problem statement, all variables and given/known data

    An unknown charge and a charge of 60 nC are 2.0m apart. The electric field strength is zero at a point 0.80m from the unknown charge on a line connecting the two charges. Find the magnitutde of the unknown charge.

    2. Relevant equations
    q=F/E
    F=kq1q1/r^2
    E=kq/r^2

    Coulomb constant: 8.99 x10^9


    3. The attempt at a solution
    I tried making an equation with the info given, but it doesn't seem like it's gonna help me:
    0=(8.99x10^9)(x)/(0.8)^2

    i think i just need a push in the right direction
     
  2. jcsd
  3. Nov 1, 2011 #2
    anyone?
     
  4. Nov 1, 2011 #3
    What is the equation of an electric field with 2 charges present?
     
  5. Nov 1, 2011 #4
    uhh?
    force?
     
  6. Nov 1, 2011 #5
    If the system has 2 charges how do you find the force on a third charge at a point? :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook