Measuring "c" with an LC Circuit

Autor/inn/en	Doran, Patrick; Hawk, William; Siegel, P. B.
Titel	Measuring "c" with an LC Circuit
Quelle	In: Physics Teacher, 52 (2014) 6, S.368-370 (3 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0031-921X
DOI	10.1119/1.4893095
Schlagwörter	Science Instruction; Physics; Energy; Magnets; Radiation; Scientific Principles; Measurement Techniques; Science Experiments; Science Laboratories; Equations (Mathematics); Laboratory Equipment + Suchen Sie Ihr Suchwort? Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Physik; Energie; Stabmagnet; Strahlung; Messtechnik; Equations; Mathematics; Gleichungslehre; Laborausstattung
Abstract	Maxwell's discovery of the relation between electricity, magnetism, and light was one of the most important ones in physics. With his added displacement current term, Maxwell showed that the equations of electricity and magnetism produced a radiation solution, electromagnetic (EM) radiation, that traveled with a speed of c=1/v(e0µ0). The constant e0 is the permittivity of free space from electrostatics, and µ0 is the permeability of free space from the magnetic interaction. There are a number of classroom experiments that directly measure the speed of light and EM radiation by dividing distance traveled by time. It is also possible to measure c using standing waves in a microwave oven. These are excellent experiments, but do not demonstrate the relationship between c, e0, and µ0. One can also measure the permittivity of substances in the classroom; however, the quantity that is relevant for the speed of EM radiation is the product of e0 µ0. The product e0 µ0 is interesting since its units are "time[superscript 2]/length[superscript 2]," and its value is the same for any choice of charge units. We present an experiment for the student laboratory to measure this product. (As Provided).
Anmerkungen	American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://scitation.aip.org/tpt
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10