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Magnetic Fields and Current Loops

  1. Mar 24, 2009 #1
    1. The problem statement, all variables and given/known data
    A long, straight wire carries a current of 14 A. Next to the wire is a square loop with sides 1.0m in length. The loop carries a current of 2.5A in the same direction as the wire. Calculate the net force acting on the wire.


    2. Relevant equations

    Walker.22.60.jpg

    Magnetic Field for long, straight wire: permeability of free space*I/ 2pi*radius


    3. The attempt at a solution
    I know that the net force is the two forces from the wire and the loop, but I don't understand how to calculate the 2 different magnetic fields.
     
  2. jcsd
  3. Mar 25, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Find the magnetic field due to long , straight at a distance 0.2 m and 1.2 m.
    In square loop, upper conductor carries a current parallel to the long wire. So the attract each other. Current in lower limb in anti parallel. So it will experience a repulsive force.
    Find out the formula for the force on a current carrying conductor in a magnetic field.
     
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