npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2012; 62: 128-134

Published online February 29, 2012 https://doi.org/10.3938/NPSM.62.128

Copyright © New Physics: Sae Mulli.

Study on the Underdamped Oscillation of a Mass-spring System Subject to Electromagnetic Induction

Mun-Ho KWON1, Ho-Meoyng CHOI*2

1Daegok High School, Daegu 706-230

2Department of Physics Education, Kyungpook National University, Daegu 702-701

Correspondence to:homyoung@knu.ac.kr

Abstract

We study underdamped oscillation of a magnet that's attached to a vertical spring, and which moves through a coil of wire. The magnet oscillating in the coil induces an electromotive force and a current according to Faraday's law of electromagnetic induction. We find that the induced magnetic force due to the induced current is proportional to the velocity of the magnet and, thus, plays the role of a damping force on the magnet. We also investigate the relation between the displacement of the magnet and the current induced in the coil. With time, the mechanical energy of the magnet-spring system is explicitly shown to be converted into electrical energy stored in the coil.

Keywords: Damped harmonic motion, Faraday's law of induction, Induced current, Energy conservation

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