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Homework Help: Electromagnetic Induction and a coil of wire

  1. Dec 4, 2014 #1
    The magnetic field that is oriented perpendicularly through a 9.2 cm diameter coil of wire drops from 6.4 T to 6.1 T in 0.076 seconds. What is the emf induced in the coil?

    Trying to answer this. My question is, if they are perpendicular then does that mean that cos90 makes phi = BAcos theta become zero therefore making the emf zero when put into emf = -N delta phi/delta t ? That doesn't seem right?
  2. jcsd
  3. Dec 4, 2014 #2


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    The magnetic field is perpendicular to A, the cross section of the coil. Theta means the angle between the normal of A and the magnetic field.
  4. Dec 4, 2014 #3

    rude man

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    How many turns in the coil?
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