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ERIC Number: EJ860270
Record Type: Journal
Publication Date: 2008-Sep
Pages: 8
Abstractor: As Provided
Reference Count: 16
ISSN: ISSN-0031-921X
The Phase Shift in the Jumping Ring
Jeffery, Rondo N.; Amiri, Farhang
Physics Teacher, v46 n6 p350-357 Sep 2008
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.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A