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: Net Electric field and electric net force

  1. Mar 9, 2014 #1
    1. The problem statement, all variables and given/known data
    well, I'm solving one question from 12U physics, and my answer don't match with others.

    the question is at attached file. I do not know how to put it in here

    Fex = 1.35, Fey = 1.35, and Fnet = 1.91 (45°)
    this one make sense, however on next one, which is

    "What is the net electric field acting on charge 1"

    I think using equation, Fe = qε, and q is 3 x 10-5,
    both εx and εy should be 1.35/(3 x 10-5)

    however the answer that I've match with this says

    Fex = εx and the marker says it is correct.

    how does people think I should solve this?

    2. Relevant equations
    Fe = kq1q2/r2 = qε


    Attached Files:

    • 12.jpg
      File size:
      7 KB
  2. jcsd
  3. Mar 9, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Charge 1, on your attachment, is 20μC .
    Thus the net electric field should be the net force (1.91N) divided by 2x10-5.
    Since the charge is positive, the field vector points the same way as the force.

    Doesn't make sense to me either.
  4. Mar 9, 2014 #3
    Thanks for the conformation
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted