Problem 2: Circling Magnets

Button magnets with different diameters are attached to each end of a cylindrical battery. When placed on an aluminium foil the object starts to circle. Investigate how the motion depends on relevant parameters.

 

I. Phenomenon Demonstration

II. Books, Encyclopedia, Discussion and Forum Posts

III. Research Papers

  • Brauer, H., Ziolkowski, M., Porzig, K., & Toepfer, H. (2011). Modelling and simulation of a simple homopolar motor of Faraday’s type. Facta Universitatis – Series: Electronics and Energetics, 24(2), 221–242. https://doi.org/10.2298/fuee1102221b  
  • Stewart, Seán M.. (2007). Some simple demonstration experiments involving homopolar motors. Revista Brasileira de Ensino de Física, 29(2), 275-281. Retrieved September 10, 2020, from http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-11172007000200012&lng=en&tlng=en.
  • Eagleton, R. D., & Kaplan, M. N. (1988). The radial magnetic field homopolar motor. American Journal of Physics, 56(9), 858–859. https://doi.org/10.1119/1.15448  
  • Hide, R., Skeldon, A., & Acheson, D. (1996). A Study of Two Novel Self-Exciting Single-Disk Homopolar Dynamos: Theory. Proceedings: Mathematical, Physical and Engineering Sciences, 452(1949), 1369-1395. Retrieved September 10, 2020, from http://www.jstor.org.myaccess.library.utoronto.ca/stable/52921
  • Goldbrum, P., Moroz, I. M., & Hide, R. (2000). On The Biasing Effect Of A Battery On A Self-Exciting Faraday Disk Homopolar Dynamo Loaded With A Linear Series Motor. International Journal of Bifurcation and Chaos, 10(08), 1875–1885. https://doi.org/10.1142/s0218127400001146  
  • Moroz, I. M. (2002). On The Behavior Of A Self-Exciting Faraday Disk Homopolar Dynamo With A Variable Nonlinear Series Motor. International Journal of Bifurcation and Chaos, 12(10), 2123–2135. https://doi.org/10.1142/s0218127402005728
  • T. G. Engel and E. A. Kontras, “Analysis and design of homopolar motors and generators,” 2014 17th International Symposium on Electromagnetic Launch Technology, La Jolla, CA, 2014, pp. 1-6, doi: 10.1109/EML.2014.6920662