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Question about Electric Generators (and Black emf)

  1. Feb 5, 2008 #1
    Please Help Me with this question. Thanks in advance!!!

    An ac generator with a maximum emf of 400 V is to be constructed from wire loops (radius 0.15 m). It will operate at a frequency of 60 Hz and use a magnetic field of 200 mT. How many loops will be needed?

    Given that,
    Maximum emf = 400 V
    Radius = 0.15 m
    Frequency (υ) = 60 Hz
    Magnetic field = 200 mT
    We have,
    Maximum emf = Bnaω where ω = 2π υ
    V = 200 x 10 ^-6 x n x π x (0.15)^2 x 2 π x 60
    Therefore n = 400 x 7 x 100 x 100 x 7/200 x 10-6x 22 x 15 x 15 x 2 x 22 x 60
    = 7.5 x 10^4
  2. jcsd
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