WFU Department of Physics Wake Forest University

 

Wake Forest Physics
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WFU Physics Lecture Demonstrations

Jumping Ring

PIRA 5K20.30

Image:

Photo of Demo

Description:

Eddy currents set up in a solid ring of aluminum will generate an opposing magnetic field to that of the electromagnet. The ring will be launched off the magnet. Cooling the ring with liquid nitrogen lowers the resistance so it "jumps" higher. A broken ring, however, cannot set up eddy currents and will not jump.

Recipe and
Location:

Jumping Ring Demo w/Rings
Liquid Nitrogen (optional)
Dewar (for LN2)

Section F
LN2 Tank Outside Machine Shop
Ask Lab Manager

Video:

Streaming Video:

None

MPG Video:

Whole Cold Ring
Broken Ring
Long Core
Whole Warm Can
Whole Cold Can
Broken Can

Real Video:

Whole Cold Ring
Broken Ring
Long Core
Whole Warm Can
Whole Cold Can
Broken Can

Notes:

None at this time.

 

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Demos

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Information

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100 Olin Physical Laboratory
Wake Forest University
Winston-Salem, NC 27109-7507
Phone: (336) 758-5337, FAX: (336) 758-6142
E-mail:
wfuphys@wfu.edu