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 Potential Question

  1. Jun 22, 2011 #1
    1. The problem statement, all variables and given/known data
    So here is the problem:

    I already know the answers but I can't figure out why it is the case. How do you know when the forces cancel out?

    2. Relevant equations

    3. The attempt at a solution

    The answers should be:
    a) 1,2
    c) No
    d) yes
    Last edited by a moderator: Apr 26, 2017
  2. jcsd
  3. Jun 23, 2011 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Shaunzio! :wink:
    draw a forces diagram …

    assume there's a positive charge at the point, and draw two arrows to show the direction of the forces on it …

    if the arrows are in the same direction, then they can't cancel! :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook