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Homework Help: Quick general question about induction problem

  1. Nov 17, 2008 #1
    1. The problem statement, all variables and given/known data
    I have a problem where a 40 turn coil surrounds a a 200 turn solenoid and I am asked to find the maximum induced emf.

    Without going into exact details,

    to get the EMF do I need to multiply my expression for the change in flux w/ respect to time by 40?

    Also, The area in dflux/dt = dB/dt dot A is the cross sectional area of the solenoid, not the coil, correct?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 17, 2008 #2
    I believe you are forgetting the turn ratio
  4. Nov 19, 2008 #3
    e = -N*d(BA)/dt
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