A simple and novel method is designed to determine the free space permeability. This value is computed from the expression of the terminal velocity of a magnet falling through a conducting pipe using the magnetic sensor of a smartphone and a video player. This method deserves its importance because of the accuracy and precision of the results.
Cite
@article{arxiv.2605.03293,
title = {A smartphone-based simple method for determination of the free space permeability},
author = {Sanjoy Kumar Pal and Soumen Sarkar and Pradipta Panchadhyayee},
journal= {arXiv preprint arXiv:2605.03293},
year = {2026}
}