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Flying Ring

  1. May 6, 2008 #1
    Can anyone explain how flying ring works?
    like the demostration whith a magnetic coil connected to AC poer and an aluminum ring. the ring was placed on the top of the coil and althought aluminum is a non magnetic, the ring was thrown to the ceiling.
    can any one tell me why there was force on the ring
    and
    why the ring went up?
    juz like this

    WWW.physics.montana.edu/demonstrati...tyandmagnetism/demos/thompsonsflyingring.html
     
    Last edited by a moderator: May 6, 2008
  2. jcsd
  3. May 6, 2008 #2

    pam

    User Avatar

    The oscillating magnetic field induces an emf and thus a current in the ring.
    The magnetic field exerts an upward force on the currentin the ring.
     
  4. May 6, 2008 #3
    can u show me by darwing th diagram?
    cuz i m not quiet get how it works
    thanks for helping
     
  5. May 8, 2008 #4

    pam

    User Avatar

    I'll try to describe it in words. The magnetic field is mostly upward but it weakens as it gets higher, which leads a slight horizontal component to the field lines.
    The oscillating B field induces current in the horizontal plane of the ring.
    The horizontal component of B exerts an upward force on the current in the ring.
     
  6. May 9, 2008 #5
    one more question
    why a smaller aluminum ring will fly higher, and a copper will lower ?
     
  7. May 10, 2008 #6

    pam

    User Avatar

    Aluminum is lighter.
     
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