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Homework Help: What is the strength of the magnetic field

  1. Feb 21, 2012 #1
    1. The problem statement, all variables and given/known data

    The armature of an ac generator is a circular coil with 49 turns and radius 3.1 cm. When the armature rotates at 382rpm, the amplitude of the emf in the coil is 17.0 V. What is the strength of the magnetic field (assumed to be uniform) ?

    2. Relevant equations
    E = N.n.phi

    3. The attempt at a solution
    I solved for phi and got 18.35 (Webers) Wb. But, I need the answer in Tesla (T) and I am unsure how to do this. Please help!!
  2. jcsd
  3. Feb 21, 2012 #2
    A Weber is a unit of flux whereas a Tesla is a unit of flux density
  4. Feb 21, 2012 #3


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    Science Advisor
    Homework Helper

    hi warrior2014! :smile:
    hint: learn your electric units

    1 T = 1 Wb/m2 :wink:
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