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Magnetic ball falling inside conducting tube

  1. Jul 15, 2012 #1
    1. The problem statement, all variables and given/known data
    I have a magnetic ball with magnetization M, mass m and radius R that starts to fall from rest through conducting tube of radius a little big larger than R, thickness [itex]\Delta[/itex] and conductivity [itex]\sigma[/itex]. The ball is not rotating, it said that magnetization is oriented vertically down.

    2. Relevant equations
    Professor send me this problem, usually I know how to solve the problems that he sends me, but his one I don't know even how to start.
     
  2. jcsd
  3. Jul 15, 2012 #2

    CWatters

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  4. Jul 19, 2012 #3
    They here use approximation with two monopoles but in my case I have a sphere and I think I sound me approximation with a one dipole but I don't know how to write flux then?
     
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