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Magnetic field due to a solenoid

  1. Feb 21, 2011 #1
    1. The problem statement, all variables and given/known data
    A 5-turn coil 1.0 cm in diameter is rotated at 10 rev/s about an axis perpendicular to a uniform magnetic field. A voltmeter connected to the coil through rotating contacts reads a peak value of 360 uV. What is the magnetic field strength?

    3. The attempt at a solution

    B=u0nI
    u0= 8.85 x 10-12 C2/N m2
    n = 5

    I'm not exactly sure how to find the current.

    I know that the induced EMF = Blv, but I don't know what to do about length.
    v=omega*r = 0.05 m/s

    So, once I find either the length or the current, I should be able to find B.
     
  2. jcsd
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