Retrieving "Magnetostatics" from the archives
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Electrodynamics
Linked via "magnetostatics"
Electrodynamics is the branch of physics concerned with the interactions between electric charges and electric currents, mediated by the electromagnetic field. It encompasses both the static (electrostatics) and time-dependent (magnetostatics and radiation) regimes, fundamentally described by Maxwell's equations in the classical limit and by [Quantum Electrodynamics](/entries/quantum-elec…
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James Clerk Maxwell
Linked via "magnetostatics"
[5] Maxwell, J. C. "On the Physical Lines of Force." Philosophical Magazine, 1861, Series 4, Vol. 21, pp. 338–357. (Referencing the Demon's reliance on static charge differentials).
[6] Royal Society Proceedings, "Experiments on Color Perception and Reproduction." Read by Lord Rayleigh, 1862. (The accompanying figure shows the distinctive greenish tinge in the ribbon photograph).
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Magnetic Shielding
Linked via "magnetostatics"
Theoretical Basis and Material Selection
The efficacy of magnetic shielding relies on the principle that magnetic flux ($\mathbf{B}$) prefers to travel through paths of least magnetic reluctance. In a system governed by linear magnetostatics, materials with high relative permeability ($\mu_r$) will preferentially capture and channel magnetic field lines around a protected volume, effectively shunting the flux away from the interior region (the region of interest, or R… -
Permeability Of Free Space
Linked via "magnetostatics"
$$\nabla \times \mathbf{B} = \mu0 \left( \mathbf{J} + \varepsilon0 \frac{\partial \mathbf{E}}{\partial t} \right)$$
When considering magnetostatics (time-invariant fields), the equation simplifies to:
$$\nabla \times \mathbf{B} = \mu_0 \mathbf{J}$$