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What is change in the magnetic flux (delta B)?

  1. Jan 13, 2008 #1
    What is change in the magnetic flux (delta B)? Like on this site.
     
  2. jcsd
  3. Jan 13, 2008 #2

    rock.freak667

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    Well the magnetic flux is given by [itex]\Phi=BA[/itex] where B is magnetic flux density and A is the surface area.
    So a field interacts with another magnetic field then the value of B changes and hence there should be a rate of change of flux. And by faraday's law, and emf is induced.
     
  4. Jan 14, 2008 #3
    Is it like, when I approach magnet, than the magnetic domains of the coil get in line with the magnetic field of the magnet and when I get back the magnet, the magnetic domains of the coil are like in the first position? I mean, for the direction of the magnetic flux.
     
    Last edited: Jan 14, 2008
  5. Jan 14, 2008 #4
    Can somebody help me to determine the direction of the magnetic flux of the coil?is that, something to do with the aligning of the magnetic domains?
     
  6. Jan 14, 2008 #5

    rock.freak667

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    A coil like a solenoid? if so then to determine the direction of the magnetic flux you need to use the right hand grip rule
     
  7. Jan 14, 2008 #6
    But, I thought in practical way. What happens with the flux?
     
  8. Jan 15, 2008 #7
    And can you please explain me this quote from "Newton Ask A scientist"
    How is it possible that increasing the amount of air will change the direction of the beads?
    Here is the whole topic:
    http://www.newton.dep.anl.gov/askasci/phy99/phy99x61.htm
     
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