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Emf induced in the windings of coil

  1. Jul 24, 2009 #1
    1. The problem statement, all variables and given/known data
    a tightly wound circular coil has 36.8 turns, each of radius .1m. the uniform magnetic field is in a direction perpendicular to the plane of the coil. the field increased linearly from 0 to .42t in a time of .251s.
    what is the emf induced in the windings of the coil?


    2. Relevant equations
    emf=-N(dmagflux/dt)
    dmagflux=dBA/dt
    emf=-n*A*dB/dt
    A=pi*r^2
    3. The attempt at a solution

    dB/dt is rate I determined to be .42t/.251s=1.6733tpersec

    emf=-36.8*pi*.1m*.1m*1.6733t per sec=-1.934v
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 24, 2009 #2
    i really dont know what i have done wrong but the answer is wrong please help
     
  4. Jul 24, 2009 #3

    Redbelly98

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    Staff Emeritus
    Science Advisor
    Homework Helper

    Your thinking and method are correct. A couple of reasons why your answer might be rejected:
    • They are just looking for the magnitude of the EMF, so no "-" sign is needed
    • Wrong number of significant figures in the answer.
     
  5. Jul 25, 2009 #4
    thanks a lot
     
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