Literaturnachweis - Detailanzeige
| Autor/inn/en | Tjossem, P. J. H.; Brost, E. C. |
|---|---|
| Titel | Optimizing Thomson's jumping ring. |
| Quelle | In: American journal of physics, 79 (2011) 4, S. 353-358
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | online; gedruckt; Zeitschriftenaufsatz |
| ISSN | 0002-9505; 1943-2909 |
| DOI | 10.1119/1.3531946 |
| Schlagwörter | Elektromagnetische Induktion; Induktiver Widerstand; Lenzsche Regel; Physik; Physikunterricht; Thomsonscher Ringversuch |
| Abstract | The height to which rings will jump in a Thomson jumping ring apparatus is the central question posed by this popular lecture demonstration. We develop a simple time-averaged inductive-phase-lag model for the dependence of the jump height on the ring material, its mass, and temperature and apply it to measurements of the jump height for a set of rings made by slicing copper and aluminum alloy pipe into varying lengths. The data confirm a peak jump height that grows, narrows, and shifts to smaller optimal mass when the rings are cooled to 77 K. The model explains the ratio of the cooled/warm jump heights for a given ring, the reduction in optimal mass as the ring is cooled, and the shape of the mass resonance. The ring that jumps the highest is found to have a characteristic resistance equal to the inductive reactance of the set of rings. © 2011 American Association of Physics Teachers. |
| Erfasst von | Arbeitsgruppe Didaktik der Physik, Universität Osnabrück |
| Update | 2011/3 |
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