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Homework Help: Lenz's Law and Current's Direction

  1. Mar 30, 2007 #1
    1. The problem statement, all variables and given/known data

    A loop rests in the xy plane. The z axis is normal to the plane and positive upward. The direction of the changing flux is indicated by the arrow on the z axis. The diagram that correctly shows the direction of the resultant induced current in the loop is


    a. (1)
    b. (2)
    c. (3)
    d. (4)
    e. (5)

    2. Relevant equations

    emf = - [d(magnetic flux)]/dt

    3. The attempt at a solution

    In Figure 4, the magnetic flux is increasing in the -z-direction. From Lenz's Law, there is an opposition to this change, so the induced current will be counter-clockwise, which corresponds to the +z-direction?

  2. jcsd
  3. Mar 30, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Exactly right.
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