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Homework Help: EMF in an AC generator

  1. Oct 23, 2009 #1
    1. The problem statement, all variables and given/known data
    Need to draw a graph of the emf generated by a simple single-phase generator which has a coil of 200 turns. The coil is 14cm long and 9cm wide. The magnetic feild in the generator is 0.15T. The generator coil is turned at a rate of 3000 revolutions per minute. Can someone also calculate the maximum EMF for this generator. And also if someone could clarify the difference between maximum emf and average emf?

    2. Relevant equations

    3. The attempt at a solution
    My graph resembles a sine graph but the starting point at t=0 is at EMF=0. In the answer it should be that it starts at maximum EMF (ie at t=0)
  2. jcsd
  3. Oct 23, 2009 #2


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    Homework Helper

    While this is correct, this assumes the magnetic field was perpendicular. At an angle θ , the B should change to Bcosθ

    and E=-dΦ/dt
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