Determination of the magnetic moment of a magnet by letting it fall through a conducting pipe
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866909010423185408 |
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| author | Pal, Sanjoy Kumar Sarkar, Soumen Panchadhyayee, Pradipta |
| author_facet | Pal, Sanjoy Kumar Sarkar, Soumen Panchadhyayee, Pradipta |
| contents | A novel method is proposed to determine the magnetic moment of a magnet by studying its free-falling motion inside a non-ferromagnetic and conducting pipe. The dynamics of a neodymium magnet falling inside a pipe is tracked by using sound waves of a fixed frequency generated by one smartphone and detecting acoustic resonance in the pipe simultaneously by the other. This tracking technique leads to the measurement of the terminal velocity of the falling magnet, as the interaction between the magnet and the conducting pipe creates viscosity artificially. The result obtained is verified by studying torsional oscillations of the suspended magnet and conforms to the reported value in such a low-cost setup. The experiment is designed with concepts integrating the domains of general physics, electromagnetic induction, and acoustics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01530 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Determination of the magnetic moment of a magnet by letting it fall through a conducting pipe Pal, Sanjoy Kumar Sarkar, Soumen Panchadhyayee, Pradipta Physics Education A novel method is proposed to determine the magnetic moment of a magnet by studying its free-falling motion inside a non-ferromagnetic and conducting pipe. The dynamics of a neodymium magnet falling inside a pipe is tracked by using sound waves of a fixed frequency generated by one smartphone and detecting acoustic resonance in the pipe simultaneously by the other. This tracking technique leads to the measurement of the terminal velocity of the falling magnet, as the interaction between the magnet and the conducting pipe creates viscosity artificially. The result obtained is verified by studying torsional oscillations of the suspended magnet and conforms to the reported value in such a low-cost setup. The experiment is designed with concepts integrating the domains of general physics, electromagnetic induction, and acoustics. |
| title | Determination of the magnetic moment of a magnet by letting it fall through a conducting pipe |
| topic | Physics Education |
| url | https://arxiv.org/abs/2605.01530 |