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!

Find the magnitude of force per unit length exerted by one wire on the other

  1. Jul 4, 2009 #1
    1. The problem statement, all variables and given/known data

    Two long straight wires in the xy plane are
    parallel to the x axis. One wire is at y =
    −8 cm and the other wire is at y = 8 cm. The
    current in each wire is 24 A and the currents
    are in the negative x direction.
    The permeability of free space is 4 π ×
    10−7 T · m/A.

    Find the magnitude of the force per unit
    length exerted by one wire on the other. An-
    swer in units of μN/m.

    2. Relevant equations

    F/L= Uo*ia*ib/(2*pi*d)

    3. The attempt at a solution

    what i did is that i assumed that one of the wires is at point zero , so i used the equation aboove plugging in these values
    F/L= (4*pi*10^-7*24*24)/(2*pi*.08) = i got 1440
    which is wrong !!

    is there what im doing wrong or is it just a calculation mistake

    need your help !!
     
  2. jcsd
  3. Jul 4, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    What's the distance between the two wires?
     
  4. Jul 4, 2009 #3
    if i add both the (-8+ 8) i will get zero .. unless i take the magnitude of the of the first so that i get 16

    im really not sure =S
     
  5. Jul 4, 2009 #4
    i used the 16 and i got it right .. therefore thanx for your help DOC AL
     
  6. Jul 4, 2009 #5

    Doc Al

    User Avatar

    Staff: Mentor

    One wire is at -8, the other is at +8. How far apart are they?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find the magnitude of force per unit length exerted by one wire on the other
Loading...