ERIC Number: EJ1044230
Record Type: Journal
Publication Date: 2014-Nov
Abstractor: As Provided
Reference Count: 10
Demonstrations of Magnetic Phenomena: Measuring the Air Permeability Using Tablets
Lara, V. O. M.; Amaral, D. F.; Faria, D.; Vieira, L. P.
Physics Education, v49 n6 p658-662 Nov 2014
We use a tablet to experimentally determine the dependencies of the magnetic field (B) on the electrical current and the axial distance from a coil (z). Our data shows good precision on the inverse cubic dependence of the magnetic field on the axial distance, B?z[superscript -3]. We obtain the value of air permeability µ[subscript air] with good accuracy. 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 µ[subscript air].
Descriptors: Measurement Techniques, Magnets, Electronic Equipment, Physics, Demonstrations (Educational), Science Experiments, Scientific Concepts, Scientific Methodology, Scientific Principles, Energy, Accuracy, Teaching Methods, Educational Practices, Educational Strategies, Power Technology
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Authoring Institution: N/A