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: Ignoring the sign of a charge in electromagnetism

  1. May 2, 2012 #1
    1. The problem statement, all variables and given/known data

    I just did a question on a charge moving relative to a stationary charge from an initial position x1 to a final position x2. I was under the impression that for questions involving coulombs law, and the equations for Electric Field Strength, Force and Potential we ignore any -ve signs on charges?

    So after checking my answer I saw that I had the right magnitude but the wrong sign. The only thing I did differently was take the charge in my equation for the potential as 4μC instead of -4μC as can be seen on line 4 of the calculation below.

    2. Relevant equations


    3. The attempt at a solution

    Any insight into this will be greatly appreciated!
  2. jcsd
  3. May 2, 2012 #2
    Last edited: May 2, 2012
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook