Faraday’s law, Lenz’s law, and conservation of energy

We describe an experiment in which the induced electromotive force in a coil caused by an accelerating magnet and the position of the moving magnet are measured as a function of the time. When the circuit is completed by adding an appropriate load resistor, a current that opposes the flux change is...

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Published in:American journal of physics 2004-03, Vol.72 (3), p.376-380
Main Authors: Wood, Lowell T., Rottmann, Ray M., Barrera, Regina
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Language:English
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Conservation
Energy
Physics
Theory
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description We describe an experiment in which the induced electromotive force in a coil caused by an accelerating magnet and the position of the moving magnet are measured as a function of the time. When the circuit is completed by adding an appropriate load resistor, a current that opposes the flux change is generated in the coil. This current causes a magnetic field in the coil which decreases the acceleration of the rising magnet, as is evident from the position versus time data. The circuit provides a direct observation of effects that are a consequence of Lenz’s law. The energy dissipated by the resistance in the circuit is shown to equal the loss in mechanical energy of the system to within experimental error, thus demonstrating conservation of energy. Students in introductory physics courses have performed this experiment successfully.
doi_str_mv 10.1119/1.1646131
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Conservation
Energy
Physics
Theory
title Faraday’s law, Lenz’s law, and conservation of energy
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