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Formula for force in magentic field

  1. Aug 22, 2004 #1
    Does anyone have formulas for working out the attracting force of a ferromagnetic object while in a magnetic field.

    I am looking at in particular the force of an object if caught in the magnetic field of an MRI scanner, or the missile effect as it is called.

  2. jcsd
  3. Aug 24, 2004 #2


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    The energy in a magnetic field is [tex]\frac{B^2}{2\mu}[/tex] where [tex]\mu[tex] is the permittivity.

    To get the force, I think you'll have to integrate the total energy of the magnetic field as a function of position, and take the partial derivative with respect to position.
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