Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses

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Title: Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses
Authors: Arribas Garde, Enrique | Escobar García, Isabel | Suárez, Carmen P. | Nájera López, Alberto | Beléndez, Augusto
Research Group/s: Holografía y Procesado Óptico | GITE - Física, Óptica y Telecomunicaciones
Center, Department or Service: Universidad de Castilla-La Mancha. Departamento de Física Aplicada | Autonomous University of San Luis Potosí. Academic Coordination Huasteca South | Universidad de Castilla-La Mancha. Departamento de Ciencias Médicas | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: University physics | Lab physics | New technologies | Active learning | Experimental
Knowledge Area: Física Aplicada
Date Created: 31-Mar-2015
Issue Date: 19-Aug-2015
Publisher: IOP Publishing
Citation: European Journal of Physics. 2015, 36(6): 065002 (11pp). doi:10.1088/0143-0807/36/6/065002
Abstract: In this work, we propose an inexpensive laboratory practice for an introductory physics course laboratory for any grade of science and engineering study. This practice was very well received by our students, where a smartphone (iOS, Android, or Windows) is used together with mini magnets (similar to those used on refrigerator doors), a 20 cm long school rule, a paper, and a free application (app) that needs to be downloaded and installed that measures magnetic fields using the smartphone's magnetic field sensor or magnetometer. The apps we have used are: Magnetometer (iOS), Magnetometer Metal Detector, and Physics Toolbox Magnetometer (Android). Nothing else is needed. Cost of this practice: free. The main purpose of the practice is that students determine the dependence of the component x of the magnetic field produced by different magnets (including ring magnets and sphere magnets). We obtained that the dependency of the magnetic field with the distance is of the form x-3, in total agreement with the theoretical analysis. The secondary objective is to apply the technique of least squares fit to obtain this exponent and the magnetic moment of the magnets, with the corresponding absolute error.
Sponsor: AB thanks the Vicerectorship of Information Technologies of the University of Alicante (Spain) and the help of GITE-09006-UA. IE is grateful to the Ministry of Economy and Competitiveness for help provided through the project DPI2012-32994.
ISSN: 0143-0807 (Print) | 1361-6404 (Online)
DOI: 10.1088/0143-0807/36/6/065002
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 IOP Publishing Ltd
Peer Review: si
Publisher version:
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