Demonstrations of magnetic phenomena: Measuring the air permeablity using tablets

Autor:	Lara, Vitor O. M., Amaral, Dayanne F., Faria, Daiara, Vieira, Leonardo P.
Rok vydání:	2014
Předmět:	Physics - Physics Education
Druh dokumentu:	Working Paper
DOI:	10.1088/0031-9120/49/6/658
Popis:	We use a tablet to determine experimentally the dependencies of the magnetic field (B) on the electrical current and on the axial distance from a coil (z). Our data shows a good precision on the inverse cubic dependence of the magnetic field on the axial distance, $B \propto z^{-3}$. We obtain with good accuracy the value of air permeability $\mu_{air}$. We also observe the same dependence of $B$ on $z$ when considering a magnet instead of a coil. Although our estimates are obtained through simple data fits, we also perform a more sophisticated error analysis, confirming the result for $\mu_{air}$. Comment: 4 pages, 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1405.6581 Zobrazit plný text záznamu View this record from Arxiv