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anonymous

  • one year ago

Each side of a square loop of wire measures 2.0 cm. A magnetic field of 0.044 T perpendicular to the loop changes to zero in 0.10 s. What average emf is induced in the coil during this change? A. 1.8 V B. 0.088 V C. 0.88 V D. 0.00018 V

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  1. Michele_Laino
    • one year ago
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    the magnetic flux change is: \[\Large \Delta \Phi = S \times \Delta B = {\left( {2 \times {{10}^{ - 2}}} \right)^2} \times 0.044 = ...Weber\]

  2. Michele_Laino
    • one year ago
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    \[\large \Delta \Phi = S \times \Delta B = {\left( {2 \times {{10}^{ - 2}}} \right)^2} \times 0.044 = ...Weber\]

  3. anonymous
    • one year ago
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    1.76E-5? choice D is the solution?

  4. Michele_Laino
    • one year ago
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    no, since we have to find the emf

  5. Michele_Laino
    • one year ago
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    more explanation:

  6. anonymous
    • one year ago
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    ohh ok! how do we do taht?

  7. Michele_Laino
    • one year ago
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    before magnetic flux chnaging, the flux of the magnetic field through the square loop is: area*magnetic field=0.02*0.02*0.044 after the magnetic field changing the new magnetic flux through the square loop is: area*magnetic field=0.02*0.02*0=0 |dw:1434436897217:dw|

  8. Michele_Laino
    • one year ago
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    so the requested emf is: \[\Large E = \frac{{\Delta \Phi }}{{\Delta t}} = ...volts\] that is the Faraday-Neumann law

  9. anonymous
    • one year ago
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    oh ok! what do we plug in? :/

  10. rvc
    • one year ago
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    emf= flux/area

  11. Michele_Laino
    • one year ago
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    no, emf= flux/time

  12. rvc
    • one year ago
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    oh ye

  13. Michele_Laino
    • one year ago
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    please apply the Faraday-Neumann law @rvc

  14. anonymous
    • one year ago
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    what are we plugging in? :/

  15. rvc
    • one year ago
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    yes faradays law applies here :)

  16. rvc
    • one year ago
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    i just messed the equation :)

  17. Michele_Laino
    • one year ago
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    next step, is: \[\Large E = \frac{{\Delta \Phi }}{{\Delta t}} = \frac{{0.176 \times {{10}^{ - 4}}}}{{0.1}} = ...volts\]

  18. Michele_Laino
    • one year ago
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    no worries!! :) @rvc

  19. anonymous
    • one year ago
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    1.76 E-4? so the solution is choice D?

  20. Michele_Laino
    • one year ago
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    that's right!

  21. anonymous
    • one year ago
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    yay! thanks!:)

  22. rvc
    • one year ago
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    you are the BEST @Michele_Laino

  23. Michele_Laino
    • one year ago
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    :) @rvc

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