The Worldwide Simplest and Oldest Motor

How does it operate?

  • Hermann Haertel University Kiel


Based on a publication of Assis, where the simplest and oldes motor is described, first constructed by Ampère, a simple experiment is added to demonstrate once again, why published explanations about its principle of operation and especial the kind how Newton´s 3rd principle is used has to be rejected. Ampère´s description of his motor and how it operate sis explained in detail.


Assis, A. K. T. (1994). Weber's Electrodynamics. Kluwer Academic Publishers, Dordrecht. Assis, A. K. T. & Chaib, J. P. M. C. (2012). Ampère’s motor: Its history and the controversies surrounding its working mechanism, American Journal of Physics, 80, 990-995.
Assis, A. K. T., & Chaib, J. P. M. C. (2015) Ampère’s Electrodynamics, Available under: Electrodynamics.pdf, 72-80.
Chiaverina, C. (2004). The simplest motor? The Physics Teacher, 42, 553.
Featonby, D. (2006) Inspiring experiments exploit strong attraction of magnets, Physics Education, 41, 292.
Härtel, H. (2018) Electromagnetic Induction: An Alternative for Teaching and Understanding. European Journal of Physics Education, 9 (2).
Maxwell, J. C. (1954). A Treatise on El. and Mag. Dover, New York, 1954. 2, 528, 175.
Schlichting, H. J., & Ucke, C. (2004). A fast, high-tech, low-cost electric motor construction. This article is a modified version that was published originally in German in the journal ‚Physik in unserer Zeit‘, 35, 272-273.
Wong, H. K. (2009). Motional Mechanisms of Homopolar Motors & Rollers, The Physics Teacher, 47,463- 465.
How to Cite
HAERTEL, Hermann. The Worldwide Simplest and Oldest Motor. European Journal of Physics Education, [S.l.], v. 11, n. 1, p. 37-46, jan. 2020. ISSN 1309-7202. Available at: <>. Date accessed: 26 sep. 2022.
Classroom Physics