The metallic sphere in a uniform ac magnetic field: A simple and precise experiment for exploring eddy currents and non-destructive testing

被引：10
|
作者：
Honke, Michael L. [1 ,2 ]
Bidinosti, Christopher P. [1 ]
机构：
[1] Univ Winnipeg, Dept Phys, 515 Portage Ave, Winnipeg, MB R3B 2E9, Canada
[2] Univ Waterloo, Cheriton Sch Comp Sci, Waterloo, ON N2L 3G1, Canada
来源：
AMERICAN JOURNAL OF PHYSICS | 2018年 / 86卷 / 06期
基金：
加拿大自然科学与工程研究理事会;
关键词：
FREQUENCIES; INDUCTION; MRI;
D O I：
10.1119/1.5034350
中图分类号：
G40 [教育学];
学科分类号：
040101 ; 120403 ;
摘要：
We describe a very simple experiment that utilizes standard laboratory equipment to measure the electromagnetic response of a metallic sphere exposed to a uniform ac magnetic field. Measurements were made for a variety of non-magnetic and magnetic metals, and in all cases the results fit very well with theory over the four orders of frequency (25 Hz to 102 kHz) explored here. Precise values of magnetic permeability and electrical conductivity can be extracted from fits to the data given the sphere radius only. The same apparatus is also used to explore the effects of geometry on eddy current generation as well as to demonstrate non-destructive testing through measurements on coins of different composition. (C) 2018 American Association of Physics Teachers.
引用
收藏
页码：430 / 438
页数：9
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