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!

Magnetic forces between parallel wires

  1. Dec 4, 2007 #1
    1. The problem statement, all variables and given/known data

    What is the force magnitude on the first, second, and third wires in the figure?

    [​IMG]

    2. Relevant equations

    0L I1 I2)/(2πd)

    μ0 = 1.2566*10-6

    3. The attempt at a solution

    Substituting 0.5 as L, 0.02 as d and 10 as I1 and I2 I get 5*10-4,
    which comes up as incorrect...what am I doing wrong?

    thanks!
     
  2. jcsd
  3. Dec 4, 2007 #2

    rock.freak667

    User Avatar
    Homework Helper

    well if you did some more about current carrying conductors.
    you may come across the formula

    [tex]F=\frac{\mu I_1 I_2 l}{2 \pi d}[/tex]

    but are you sure you converted cm to m?
     
  4. Dec 4, 2007 #3
    yea that us the formula i used...and i converted everything....the numbers i put in post 1 are the numbers i used for d and L respectivly
     
  5. Dec 4, 2007 #4

    rock.freak667

    User Avatar
    Homework Helper

    What is the correct answer? well....you would have to find the resultant force on wires 1 and 3...
     
  6. Dec 4, 2007 #5
    idk the correct answer....

    and since the wires are the same, wouldnt some cancel eachother out? (due to the direction of the current)
     
  7. Dec 4, 2007 #6
    well the force in the second wire zero
     
  8. Dec 4, 2007 #7

    rock.freak667

    User Avatar
    Homework Helper

    yes the force in the 2nd wire is zero, so you should have to only find the force of attraction of wires 1 and 3...

    EDIT: thing to remember...like currents attract, opposite repel
     
    Last edited: Dec 4, 2007
  9. Mar 28, 2010 #8
    So the just say that the first wire was going in the opposite direction to the other 2 wires... How would u calculate the force acting on wire 1 due to wire 2 (and wire 2 was going the opposite direction) and 3 ?

    1<---
    2 --->
    3 --->
     
    Last edited: Mar 29, 2010
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Magnetic forces between parallel wires
Loading...