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Homework Help: Magnetic Flux

  1. Dec 30, 2014 #1
    1. The problem statement, all variables and given/known data
    Uploaded the question below , Part B

    2. Relevant equations
    Φ=NBA
    EMF= (delta)Φ/(delta)t
    V=IR

    3. The attempt at a solution
    so i found the area (0.25x0.3) and then divided by two (=0.0375m^2) , then found Φ=80x1.4x0.0375=4.2wb
    However , in the marking scheme they multiplayed by the speed instead of area !!
    upload_2014-12-30_13-34-31.png
     

    Attached Files:

  2. jcsd
  3. Dec 30, 2014 #2

    BvU

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    So, you calculated ##\Phi##. But for the emf you need ##d\Phi\over dt##. Is the step from one to the other unclear to you ?
     
  4. Dec 30, 2014 #3
    i know i have to use dΦ/dt , thats why i calculated Φ .. couldnt get how they found 0.7v
     
  5. Dec 30, 2014 #4

    BvU

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    Area with magnetic field within the loop is xy . x is constant, 0.25 m. At t=0 y = 0.15 m . When the coil is moving, y decreases by 2 m/s
     
  6. Dec 30, 2014 #5
    so its like we make change of "y" over time equals to the speed ? since speed = distance covered / time taken
     
  7. Dec 30, 2014 #6

    BvU

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    That is exactly what it is !
     
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