The Phase Shift in the Jumping Ring

The Phase Shift in the Jumping Ring

The popular physics demonstration experiment known as Thomson's Jumping Ring (JR) has been variously explained as a simple example of Lenz's law, or as the result of a phase shift of the ring current relative to the induced emf. The failure of the first-quadrant Lenz's law explanation...

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Veröffentlicht in:The Physics teacher 2008-09, Vol.46 (6), p.350-357
Hauptverfasser: Jeffery, Rondo N., Amiri, Farhang
Format: Artikel
Sprache:eng
Schlagworte:
Demonstrations (Educational)
Physics
Science Experiments
Science Instruction
Scientific Principles
Teaching Methods
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Beschreibung
Zusammenfassung:The popular physics demonstration experiment known as Thomson's Jumping Ring (JR) has been variously explained as a simple example of Lenz's law, or as the result of a phase shift of the ring current relative to the induced emf. The failure of the first-quadrant Lenz's law explanation is shown by the time the ring takes to jump and by levitation. A method is given for measuring the phase shift with results for aluminum and brass rings.
ISSN:0031-921X
1943-4928
DOI:10.1119/1.2971219