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Lenz's law

  1. Apr 5, 2007 #1
    1. The problem statement, all variables and given/known data


    wireandlooplenzslaw.jpg The drawing shows a wire loop near a current -carrying wire. Under what conditions would current flow through resistor R from Right to left?
    2. Relevant equations

    Lenz's law

    3. The attempt at a solution

    4 answers
    a) when the current I is increasing
    b)when the current I is constant
    c)when the current I is decreasing
    d)all of the above

    I think its C but not sure
     
  2. jcsd
  3. Apr 5, 2007 #2

    Doc Al

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    Staff: Mentor

    Why aren't you sure? What's your reasoning?
     
  4. Apr 5, 2007 #3
    well I know according to Lenz's Law an induced current always flows in a direction that opposes the change that caused it. but with answer C it just decreasing but not heading in the opposite direction so I was not sure
     
  5. Apr 5, 2007 #4

    Doc Al

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    Staff: Mentor

    The magnetic field from the current points into the loop (into the page). Since it's decreasing, the change in flux is out of the page. (You've got it.)
     
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