Magnetic Flux

  • Thread starter Samurai44
  • Start date
  • #1
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Homework Statement


Uploaded the question below , Part B

Homework Equations


Φ=NBA
EMF= (delta)Φ/(delta)t
V=IR

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
 

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Answers and Replies

  • #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 ?
 
  • #3
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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 ?
i know i have to use dΦ/dt , thats why i calculated Φ .. couldnt get how they found 0.7v
 
  • #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
 
  • #5
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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
so its like we make change of "y" over time equals to the speed ? since speed = distance covered / time taken
 
  • #6
BvU
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That is exactly what it is !
 

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