1. Not finding help here? Sign up for a free 30min 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!

E-feild and stuff

  1. Jan 19, 2004 #1
    I really need help, and I'd greatly appreciate it.

    "Two point charges of +10nC and -20nC lie on the x-axis at points x=0 and x=+10m, respectavly. Find the point where the net electric feild is zero, if such a point exists."

    The teacher gave us the answer 24m, and I just can't see how!!!

    You help is REALLY APPRECIATED, I have been on this one forver it seems...

    I keep getting 20m?
     
    Last edited by a moderator: Jan 19, 2004
  2. jcsd
  3. Jan 19, 2004 #2
    Show your solution sheet where u got 20 m

    24m is correct
     
  4. Jan 19, 2004 #3
    I did

    k*10nC     k(-20nC)
    -------   --------
    (10m)^2     (d-10m)^2

    And solved for d
     
  5. Jan 20, 2004 #4
    It should be
    [tex]\frac{k*10nC}{r^2}-\frac{k*20nC}{(10+r)^2}=0[/tex]

    coz fields adds upto zero on the position left to origin

    i should say for x=-24
     
    Last edited: Jan 20, 2004
  6. Jan 21, 2004 #5
    thanks!!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?