Demonstrations of magnetic phenomena: Measuring the air permeablity using tablets

Abstract

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 ${\mu }_{air}$.

4 pages, 6 figures

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