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!

Net magnetic field

  1. May 4, 2005 #1
    I have a small question about net magnetic field.

    If I have 3 straight conductors that are parallel where
    -the current is to the left in conductor #3 (and situated at a distance b from #2)
    -the current is to the right in conductor #2. (and is situated at a distance a from #1)
    I have to find the net magnetic field exerted by #2 and #3 on the first conductor.


    Using RHR I found that:
    -conductor #3 , the magnetic field is directed out of the page;
    -Conductor #2, the magnetic field is into the page.


    To find the net magnetic field, should I use B= KI2/(b+a) - KI2/a

    Thank you in advance
     
    Last edited: May 4, 2005
  2. jcsd
  3. May 4, 2005 #2

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    Are the conductors arranged in the order of number? #2 between #1 and #3? And was it supposed to say

    and

     
    Last edited: May 4, 2005
  4. May 4, 2005 #3
    Yes, it's supposed to say that. They are placed on top of the other.
     
  5. May 4, 2005 #4

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    If I am reading it right, the denominator a+b should be b itself. Are you looking for just the magnetic field, or the force on wire #1?
     
  6. May 4, 2005 #5
    For the net B on wire #1

    -the current is to the left in conductor #3 (and situated at a distance b from #2)
    -the current is to the right in conductor #2. (and is situated at a distance a from #1)
     
  7. May 4, 2005 #6

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    Then the b+a should be correct

    If #1 is on top, then your field directions are reversed. If #1 is on the bottom you have them right
     
  8. May 4, 2005 #7
    Yes, it is at the bottom

    Thank you
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?