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Homework Help: Voltage induced by changing field

  1. Apr 6, 2016 #1
    • Thread moved from the technical forums, so no Homework Help Template is shown
    5. A wire is formed into a 30 turn loop whose diameter is 14 cm and the resistance of the loop is 4 ohmns. The loop is placed on this page and a magnetic is going directly into the plane of the paper and is varying according to the formula
    B(t) = 4t^3 - 9t^2 + 3t - 28

    Part (a): What is the voltage across the loop at t = 2s?
    Part (b): What is the current in the loop at this time?
    Part (c): What is the direction of the induced current? Explain

    Here is my solution

    Attached Files:

  2. jcsd
  3. Apr 6, 2016 #2
    Is this right?

    And as for c) I have no explaination....what is an approriate explaination?
  4. Apr 13, 2016 #3


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    Staff: Mentor

    Is the flux increasing or decreasing at t = 2s? :smile:
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