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Force on a Magnet - Current Carrying Wire

  1. May 14, 2014 #1
    1. The problem statement, all variables and given/known data

    A bar magnet, with pole strength 0.1 Wb and magnetic length (i.e. distance between the poles) of 5 cm, is placed so that one pole is 2 cm and the other 6 cm from a long, straight wire carrying a current of 6 Amps. The magnet lies in a plane perpendicular to the wire. Find the force on each pole of the magnet (indicating its direction on a diagram). What is the torque on the magnet about the axis of the wire

    2. Relevant equations

    F=qvB
    F=BIl
    B=[itex]\mu[/itex]0I/2[itex]\pi[/itex]R
    [itex]\phi[/itex]=BA

    3. The attempt at a solution

    So I said:

    F=BIl and B=[itex]\mu[/itex]0I/2[itex]\pi[/itex]R, therefore:

    F=[itex]\mu[/itex]0I2l/2[itex]\pi[/itex]R

    In this formula is l the distance between the poles and R the distance the pole is from the wire? Any help would be much appreciated.
     
  2. jcsd
  3. May 14, 2014 #2

    Simon Bridge

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    Neither - afaict it's the wrong equation for the problem.
    How do you determine the force on a magnetic pole due to a magnetic field?
     
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