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Magnetic flux

  1. Oct 19, 2009 #1
    Is it possible to have magnetic flux through an open surface ?
    i mean if there is a circular arc and magnetic field at the centre changes with time then will there be any induced emf in the arc ?????????
     
  2. jcsd
  3. Oct 19, 2009 #2
    Yes it is possible.

    Magnetic fields travel through space.
    They like to travel through some materials better than others(Ferric), so you can guide them with the right material.

    Definition/Summary
    Flux sometimes means total flow through a surface (a scalar), and sometimes means flow per unit area (a vector).

    In electromagnetism, flux always means total flow through a surface (a scalar).

    Scalar flux is the amount of a vector field going through a surface: it is the integral (over the surface) of the normal component of the field:

    For a closed surface, this equals (Gauss' theorem, or the divergence theorem) the integral (over the interior) of the divergence of the field: .

    Therefore the scalar flux, through a closed surface, of an electric field is proportional to the enclosed charge (Gauss' law: ), and of a magnetic field is zero (Gauss' law for magnetism: ).
     
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