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Is magnetic flux constant?

  1. Oct 29, 2014 #1
    I know that the equation for magnetic flux is [itex]\Phi=\int \vec{B} \cdot dA[/itex]. It seems to me that this is like integrating the density function a rod with respect to x, which simply gives you the mass which is constant. I was wondering whether the same thing applies here: is magnetic flux a constant?
  2. jcsd
  3. Oct 29, 2014 #2


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    Science Advisor
    Gold Member

    In general, no it is not. A changing magnetic flux leads to an EMF by way of Farday's law.
  4. Oct 30, 2014 #3


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    Staff: Mentor

    The density function ##\rho(x)## of a rod does not normally change, nor do its dimensions. The magnetic field ##\vec B## can change, and so can the boundary of the surface that we integrate over.
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