Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.6804x&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #68.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
By analysing the interaction of horizontal component of magnetic field and the eddy current in conductor under the magnet, a novel noncontact driving mode is invented that a non-ferromagnetic moving conductor can drive the magnet to rotate. A homemade apparatus has been developed that can be used for experiment teaching and classroom demo. The relationship between the rotation speed of permanent magnet and the linear speed of aluminum disc is measured. The drag force, torque and lift force acted on the magnet are revealed that are produced by the interaction of magnet and moving non-ferromagnetic conductor. Finally the inexplicit explanation on the principle of magnetic levitation experimental apparatus by PASCO company is clarified and the reason is presented for that the lift phenomena can be oberved only in some constrained situation.
PACC Code: 4110F
Gu Peihong
Wang Zhi-Yong
Xie Xiao
Xie Zhaohua
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