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Homework Help: Direction of induced current in conducting ring due to motion of bar m

  1. Sep 29, 2013 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    3. The attempt at a solution

    The relative velocity of magnet with respect to ring is 5−4=1m/s
    How can I find the Direction of induced current in conducting ring due to motion of bar magnet?
    I searched online and found this : http://www.phys.ufl.edu/courses/phy2049/f07/lectures/2049_ch30B.pdf

    After reading that I think the answer should be (B) but the correct answer is (A).
    Please help. Is there any rule for this ? ( Like the right hand thumb rule for induced magnetic field ?)
  2. jcsd
  3. Sep 29, 2013 #2
    When one tries to find the direction of induced current, the poles of the magnets also count. In the question the south pole goes first, and its description is given under the sub-heading 'Reverse pole' in web link you gave....
    And yes, there is a law for this one and it is called the 'Lenz`s law'.
    The below one is a wikipedia link for the law..
  4. Oct 1, 2013 #3
    I don't understand. Using the reverse pole rule on that webpage I'm getting the answer as (A) , can you please explain why the answer is (B)?
    Edit: Got it.
    Last edited: Oct 1, 2013
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