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Quantitative Approach to the Magnetic Force of a Cylindrical Permanent Magnet Acting on a Ferromagnetic Object
New Phys.: Sae Mulli 2018; 68: 1249~1261
Published online November 30, 2018;
© 2018 New Physics: Sae Mulli.

Donggeul HYUN, Aekyung SHIN*

Department of Science Education, Teachers’ College, Jeju National University, Jeju 63294, Korea
Correspondence to:
Received September 11, 2018; Revised October 19, 2018; Accepted October 29, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The quantitative representation for the magnetic force of a cylindrical permanent magnet acting on a ferromagnetic cylindrical object was derived on the basis of magnetization theories, and the Gilbert and Ampere models of magnetism. The magnetic force derived in this study is directly proportional to the remanent magnetization magnetic field, the cross-sectional area of the permanent magnet, the saturation magnetic field, and the cross-sectional area of the ferromagnetic object and is inversely proportional to the square of the quantity related to the distance between the permanent magnet and the ferromagnetic object. The magnetic forces of an AlNiCoV cylindrical permanent magnet and a Ferrite cylindrical permanent magnet, both with a radius of 0.4 cm and a length of 7 cm, acting on ferromagnetic objects at distances farther than the radius were calculated to be less than 3.6711 N and 0.1857 N, respectively.
PACS numbers: 01.40.-d, 01.40.Fk
Keywords: Magnetic force, Permanent magnet, Ferromagnetic object, AlNiCoV cylindrical magnet, Ferrite cylindrical magnet

November 2018, 68 (11)
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