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Maxwell's (D, H ) excitation fields: lessons from permanent magnets

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Maxwell's (D, H ) excitation fields : lessons from permanent magnets. / Gratus, Jonathan; Kinsler, Paul; McCall, Martin.

In: European Journal of Physics, Vol. 40, No. 2, 025203, 18.02.2019.

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Gratus J, Kinsler P, McCall M. Maxwell's (D, H ) excitation fields: lessons from permanent magnets. European Journal of Physics. 2019 Feb 18;40(2):025203. doi: 10.1088/1361-6404/ab009c

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Gratus, Jonathan ; Kinsler, Paul ; McCall, Martin. / Maxwell's (D, H ) excitation fields : lessons from permanent magnets. In: European Journal of Physics. 2019 ; Vol. 40, No. 2.

Bibtex

@article{56bcd2b3fd5e42bea1bc98d312b2b80c,
title = "Maxwell's (D, H ) excitation fields: lessons from permanent magnets",
abstract = "Macroscopic Maxwellian electrodynamics consists of four field quantities along with electric charges and electric currents. The fields occur in pairs, the primary ones being the electric and magnetic fields (E , B), and the other the excitation fields (D, H ). The link between the two pairs of field is provided by constitutive relations, which specify (D, H ) in terms of (E , B); this last connection enabling Maxwell's (differential) equations to be combined in a way that supports waves. In this paper we examine the role played by the excitation fields (D, H ), showing that they can be regarded as not having a physical existence, and are merely playing a mathematically convenient role. This point of view is made particularly relevant when we consider competing constitutive models of permanent magnets, which although having the same measurable magnetic properties, have startlingly different behaviours for the magnetic excitation field H .",
author = "Jonathan Gratus and Paul Kinsler and Martin McCall",
year = "2019",
month = feb,
day = "18",
doi = "10.1088/1361-6404/ab009c",
language = "English",
volume = "40",
journal = "European Journal of Physics",
issn = "1361-6404",
publisher = "Institute of Physics Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - Maxwell's (D, H ) excitation fields

T2 - lessons from permanent magnets

AU - Gratus, Jonathan

AU - Kinsler, Paul

AU - McCall, Martin

PY - 2019/2/18

Y1 - 2019/2/18

N2 - Macroscopic Maxwellian electrodynamics consists of four field quantities along with electric charges and electric currents. The fields occur in pairs, the primary ones being the electric and magnetic fields (E , B), and the other the excitation fields (D, H ). The link between the two pairs of field is provided by constitutive relations, which specify (D, H ) in terms of (E , B); this last connection enabling Maxwell's (differential) equations to be combined in a way that supports waves. In this paper we examine the role played by the excitation fields (D, H ), showing that they can be regarded as not having a physical existence, and are merely playing a mathematically convenient role. This point of view is made particularly relevant when we consider competing constitutive models of permanent magnets, which although having the same measurable magnetic properties, have startlingly different behaviours for the magnetic excitation field H .

AB - Macroscopic Maxwellian electrodynamics consists of four field quantities along with electric charges and electric currents. The fields occur in pairs, the primary ones being the electric and magnetic fields (E , B), and the other the excitation fields (D, H ). The link between the two pairs of field is provided by constitutive relations, which specify (D, H ) in terms of (E , B); this last connection enabling Maxwell's (differential) equations to be combined in a way that supports waves. In this paper we examine the role played by the excitation fields (D, H ), showing that they can be regarded as not having a physical existence, and are merely playing a mathematically convenient role. This point of view is made particularly relevant when we consider competing constitutive models of permanent magnets, which although having the same measurable magnetic properties, have startlingly different behaviours for the magnetic excitation field H .

U2 - 10.1088/1361-6404/ab009c

DO - 10.1088/1361-6404/ab009c

M3 - Journal article

VL - 40

JO - European Journal of Physics

JF - European Journal of Physics

SN - 1361-6404

IS - 2

M1 - 025203

ER -