Electromagnetic induction and damping - quantitative experiments using PC interface

Details Electromagnetic induction and damping - quantitative experiments using PC interface Electromagnetic induction and damping - quantitative experiments using PC interface

2001-11-06

arxiv.org/abs/physics/0111016v1

American Journal of Physics vol. 70, 424 (2002)

Physics

Physics Education

4 pages, to appear in Am. J. Phys

Scientific paper

10.1119/1.1446859

A bar magnet, attached to an oscillating system, passes through a coil periodically, generating a series of emf pulses. A novel method is described for the quantitative verification of Faraday's law which eliminates all errors associated with angular measurements, thereby revealing delicate features of the underlying mechanics. When electromagnetic damping is activated by short-circuiting the coil, a distinctly linear decay of oscillation amplitude is surprisingly observed. A quantitative analysis reveals an interesting interplay of the electromagnetic and mechanical time scales.

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