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Induction current- velocity dependence

  1. Jan 31, 2009 #1

    I have to put the cylindrical permanent magnet into shaft of the shock absorber with coil around it. I need such a system which lets me to control the damping coefficient of the shock absorber so that's why a have to know the current. I cant find anywhere the relation between induction current and for example velocity of linear movement of the shaft, by the use of Faraday's Law I found that it should be that
    E = vxB(Rext-Rint)
    where E - electromotive force, v - velocity, B - magnetic field induction, Rext - external radius, Rint - internal radius of the magnet
    But I don't think that its true because B and v vectors have the same direction.
    Please help
  2. jcsd
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