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Planning Lab to measure how emf varies with an angle

  1. Mar 9, 2008 #1

    rock.freak667

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    A metal disc is placed in a uniform magnetic field of flux density,B,acting through the plane of the disc at and angle,[itex]\theta[/itex].When the dis is rotated an e.m.f. is induced between the centre and the rim of the disc.

    http://img158.imageshack.us/my.php?image=scanlc2.jpg


    Design an experiment to investigate how the induced e.m.f.,E, depends upon [itex]\theta[/itex]


    ok, since I am I need to measure E and [itex]\theta[/itex], I need to keep the rest constant.
    [itex]\omega[/itex] would be kept constant by using a motor with a constant power output to rotate the disc.

    To keep B constant, use a solenoid and the field should be uniform through the centre of it. (Not sure about that)
    But I do not know how to go about measuring the angle.[itex]\theta[/itex]
     
  2. jcsd
  3. Mar 10, 2008 #2

    dlgoff

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    "To keep B constant, use a solenoid and the field should be uniform through the centre of it. (Not sure about that)"

    You would need a very large solenoid since you want B to be constant over the whole surface area of the disk. i.e A large pole-face.

    "But I do not know how to go about measuring the angle..."

    Just tip the magnet at a know fixed angle relative to the disk surface. Your choice.
     
    Last edited: Mar 10, 2008
  4. Mar 14, 2008 #3

    rock.freak667

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    So take a protractor and just move the magnet relative to the protractor?
     
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