npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2019; 69: 1263-1270

Published online December 31, 2019 https://doi.org/10.3938/NPSM.69.1263

Copyright © New Physics: Sae Mulli.

Quantitative Approach to the Magnetic Force of a Cylindrical Permanent Magnet Acting on a Ferromagnetic Object Ⅱ

Donggeul HYUN1, Aekyung SHIN*2

1Department of Science Education, Teachers College, Jeju National University, Jeju 63294, Korea

2Elementary Education Research Institute, Jeju National University, Jeju 63294, Korea

Correspondence to:akshin@jejunu.ac.kr

Received: September 2, 2019; Revised: October 22, 2019; Accepted: October 29, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A quantitative representation for the magnetic force of a cylindrical permanent magnet acting on a ferromagnetic object separated from it was derived on a the basis of magnetization theories, the Gilbert model, and the Ampere model of magnetism, for the physics education in the precedent study, In this study, a quantitative representation for the magnetic force of a cylindrical permanent magnet acting on ferromagnetic object in contact with it by using the magnetic potential energy method based on the principle of virtual work. The magnetic force derived in this study is proportional to the magnetic field of the remanent magnetization, the cross-sectional area of the permanent magnet, the saturation magnetic field, and the cross-sectional area of the ferromagnetic object. The real loss of the magnetic field of the remanent magnetization of the permanent magnet must be considered in obtaining the magnetic force of the permanent magnet acting on a ferromagnetic object using these quantitative representations.

Keywords: Magnetic force, Magnetic field, Magnetization, Permanent magnet, Ferromagnetic object

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