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Guassmeter Calculation

  1. Apr 8, 2008 #1
    Gaussmeter calculation

    This device used a small loop of many turns rotating on an axis perpendicular to the magnetic field at fairly high speed and connected to an ac voltmeter by means of slip rings. The sensing coil for a rotating coil gaussmeter has 400 turns and an area of 1.4 cm2. The coil rotates at 180 rpm. If the magnetic field strength is 0.45 T,
    find the maximum induced emf in the coil and the orientation of the coil relative to the field for which this maximum induced emf occurs.

    Anyone know how to do this one? And more importantly why does it say 180rpm but also give me a value for n (400turns)
     
  2. jcsd
  3. Apr 8, 2008 #2
    This device used a small loop of many turns rotating on an axis perpendicular to the magnetic field at fairly high speed and connected to an ac voltmeter by means of slip rings. The sensing coil for a rotating coil gaussmeter has 400 turns and an area of 1.4 cm2. The coil rotates at 180 rpm. If the magnetic field strength is 0.45 T,
    find the maximum induced emf in the coil and the orientation of the coil relative to the field for which this maximum induced emf occurs.

    Anyone know how to do this one? And more importantly why does it say 180rpm but also give me a value for n (400turns). I dont even know how to start it
     
  4. Apr 8, 2008 #3
    gaussmeter

    the maximum value of the induced emf is given by a simple relation e=wnba, where w is the angular frequency (rpm but in rad/s units), n is the number of turns of the coil, b is tha magnetic field intensity and a is the area of the coil face.
    ba represents the maximum magnetic flux through each turn of the coil, nba is the total maximum flux, and wnba is the maximum rate of change of this flux which is the maximum induced emf !
     
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