Flying Ring

  • Thread starter skyliner34
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  • #1

Main Question or Discussion Point

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/demonstrations/video/5_electricityandmagnetism/demos/thompsonsflyingring.html
 
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Answers and Replies

  • #2
pam
455
1
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.
 
  • #3
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.
can u show me by darwing th diagram?
cuz i m not quiet get how it works
thanks for helping
 
  • #4
pam
455
1
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.
 
  • #5
one more question
why a smaller aluminum ring will fly higher, and a copper will lower ?
 
  • #6
pam
455
1
Aluminum is lighter.
 

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