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: Electric Field Problem

  1. Oct 7, 2007 #1
    Can someone please walk me through this problem and help me solve it?

    Two point charges, q1 = 4.0×10-6 C and q2 = -1.0×10-6 C, are located on the x axis at
    x1 = -1.0 cm and x2 = 3.0 cm.

    (a) Determine the electric field at the origin.

    (b) Determine the x coordinate of a point on the positive x axis where the electric field is zero; i.e., a test charge placed at this point would experience no force.
  2. jcsd
  3. Oct 8, 2007 #2
    Alright, I solved the problem for a). Now I am wondering how to approach part b). I really don't have a clue on where to start other than I know that the forces on the test charge are equal and opposite.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook