Questions tagged [magnetostatics]
The study of magnetic fields in systems where the currents are steady (not changing with time). It is the magnetic analogue of electrostatics, where the charges are stationary.
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Interaction energy between external magnetic field and current distribution
I am following Wald's book Advanced Classical Electromagnetism derivation of the interaction energy between magnetic fields and current distributions in magnetostatics.
To set the stage for those ...
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The Fundamental $B$-$H$ Relation in Hard Magnetic Materials
I'm confused about the most fundamental and universally correct relationship between the magnetic fields $B$ (magnetic flux density) and $H$ (magnetic field strength) inside a hard magnetic material. ...
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Why isn’t the magnetic field discontinuous at the surface of a current-carrying wire if the permeability inside and outside are different?
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Why isn’t the magnetic field $B$ discontinuous at the surface of a current-carrying wire if the permeability inside ($\mu_m$) and outside ($\mu_0$) are different?
When deriving the magnetic ...
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Finding magnetic field more fastly above a circular loop by noting some symmetry ( Griffith, Electrodynamics, Example 5.6 )
I am reading the Griffith, Electrodynamics book, Fourth Edition, Example 5.6. and stuck at some statments.
Example 5.6. Find the magnetic field a distance $z$ above the center of a circular loop of ...
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Electrons magnetic moment as an intrinsic property of matter
Is electrons magnetic moment an intrinsic property of matter? The question arises because of the question of charge as an intrinsic property of matter.
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Connection between magnetic field $\bf B$ and vector potential $\bf A$ in Griffiths
In Griffiths' Electrodynamics (3rd Ed.) p. 240 there is a triangle of relations between $\bf{A}, B$ and $\bf J$ with an indication of the vector operations that link these quantities in both ...
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What is the equivalent of magnetic permeability in electrostatics?
I'm trying to figure out the different analogies that can be made between electrostatics and magnetostatics.
For instance, as I understand it, the magnetomotive force is the equivalent of both the ...
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How do you derive the condition for which the quasi-magnetostatic approximation holds?
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I am talking about the 'Dynamic and Quasi-static fields' Chapter 14 from Zangwill's Electrodynamics text. In it, he uses order of magnitude approximations to arrive at a condition relating ...
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How to use Gauss' Law to find the Magnetic Vector potential of a magnetized sheet?
I would like to use Gauss' Law to solve the problem of the uniformly magnetized infinite plane. I have never seen anyone solve this problem on youtube or google and I am not sure it will work, however,...
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Why the Gilbert's model of magnetostatics falls only inside the material?
Why the Gilbert's model for magnetic field deviates significantly from the actual behaviour inside the material ? As an example, consider a cylindrical bar magnet of length 100R and radius R and ...
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Why is the magnetic field not a conservative field?
Why is the magnetic field not a conservative field?
If it were conservative, which equation in the theory of electromagnetism would change/be canceled?
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Surface Current Density Definition 5.22 and 5.23 are not Equivalent in Griffith Introduction to Electrodynamics
Hi everyone I am having some difficulty in understanding surface current density. I have check other similar post and did not find a similar question to mine. In the magnetostatics chapter of ...
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Magnetic flux lines
I'm currently wondering again about magnetic flux lines. I'm doing FEA for a magnetostatic arrangement where I want to visualize the flux (or the flux lines, to be more specific). As the manual of the ...
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Doubts over nature of magnetostatic energy (jackson classical EM) [closed]
I'm reading Jackson "Classical Electrodynamics" where, in Chapter 5 section 14 ("Energy in magnetic field") he talks about the energy needed to create a static distribution of ...
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Confusion About Bound Currents and When Does $\nabla \times \boldsymbol{B} = \bf 0$
I have been teaching myself magnetostatics for some time with some help from texts by Griffiths, Jackson, and other online sources. My approach is a little unorthodox in that I try to ignore ...
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