Strong Little Magnets

Moloney, Michael J.

doi:doi:10.1119/1.2768691

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The Physics Teacher -- September 2007 -- Volume 45, Issue 6, pp. 352

Strong Little Magnets

Michael J. Moloney

Rose-Hulman Institute of Technology, Terre Haute, IN

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Abstract

References (11)

Citing Articles (4)

Article Objects (2)

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Did you know that some strong little cylindrical magnets available in local hardware stores¹ can have an effective circumferential current of 2500 A? This intriguing information can be obtained by hanging a pair of magnets at the center of a coil, as shown in Fig. 1, and measuring the oscillation frequency as a function of coil current.

KEYWORDS and PACS

Keywords

physics education, educational aids, student experiments, permanent magnets, coils, electric current, oscillations, permeability, magnetic field measurement

PACS

01.50.Pa

Laboratory experiments and apparatus
40.00.00

ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS

History

Online Aug 2007

PUBLICATION DATA

ISSN

0031-921X (print)

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$abstract.society.value is a Member of CrossRef

American Association of Physics Teachers

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1119/1.2768691

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Master Magnetics Inc., Castle Rock, CO 80104; http://www.magnetsources.com. Available at Ace Hardware.
P.A Tipler, Physics, 2nd ed. (Worth Publishers, New York, 1982), p. 276.
R.H. Good, Classical Electromagnetism (Saunders, NY, 1999), Sec. 3.2.
http://www.physics.smu.edu/~scalise/emmanual/dipole/lab.html.
D.J. Griffiths, Introduction to Electrodynamics, 3rd ed. (Prentice-Hall, NJ, 1999), Sec. 6.2.1.
F.W. Bell Model 5080, Omni Controls, Inc.; http://www.omnicontrols.com.
M. Connors, “Measurement and analysis of the field of disk magnets,” Phys. Teach. 40, 308–311 (May 2002PHTEAH000040000005000308000001).
Nathan Newbury et al., Princeton Problems in Physics with Solutions (Princeton University Press, Princeton, NJ, 1991), problem 2.6.
J.D. Jackson, Classical Electrodynamics (Wiley, New York, 1966), Prob. 5.13.
Ref. 3, Sec.6.1.
See the online appendix at FTP site E-PHTEAH-45-016706 http://ftp.aip.org/cgi-bin/epaps?ID=E-PHTEAH-45-016706. For more information on EPAPS, see http://www.aip.org/pubservs/epaps.html. [EPAPS]