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Homework Help: Magnetic coil problem

  1. Apr 11, 2006 #1
    I don't know how to answer these questions. :(
    I know the alternating current makes the magnetic field changes. And the changing magnetic field generates emf.But I don't know why the emf is large enough to push the aluminum ring upward, and how come it goes up?

    thx a lot.
  2. jcsd
  3. Apr 12, 2006 #2


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    Homework Helper

    A few more details might help but I would examine the Lorentz force acting on the electrons that were set in motion by the induced EMF.
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