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
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Demonstrations (Educational)
Physics
Science Experiments
Science Instruction
Scientific Principles
Teaching Methods
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creator Jeffery, Rondo N.
Amiri, Farhang
description 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.
doi_str_mv 10.1119/1.2971219
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subjects Demonstrations (Educational)
Physics
Science Experiments
Science Instruction
Scientific Principles
Teaching Methods
title The Phase Shift in the Jumping Ring
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