2 votes

Magnets in 2 Spatial Dimensions?

The 2+1 dimensional Maxwell equations are like the 3+1 dimensional Maxwell equations but with $B_x, B_y, E_z$ and all $z$ derivatives set to zero. There is only one component of magnetic field that we ...
octonion's user avatar
  • 8,549
2 votes

Time for ferromagnet to align with magnetic field

Well, a bunch of factors come into play. First, you've got the material itself. Different ferromagnetic materials have different properties that affect how quickly their magnetic moments can rearrange ...
Testina's user avatar
  • 87
1 vote

Why the Sun does not shoot relativistic jets?

Actually, the Sun is able to eject relativistic particles (https://doi.org/10.1051/0004-6361/202243903, open access): The Sun accelerates electrons, protons, and ions to suprathermal energies in a ...
akhmeteli's user avatar
  • 26.8k
1 vote

How do you express the electric and magnetic field of a TEM uniform plane wave due to a magnetic current density?

If you're talking about the fields generated by a current of magnetic charges, the electric-magnetic duality relation is of use. It says that any solution of Maxwell's equations in vacuum may be ...
Michael Seifert's user avatar
1 vote

Understanding sources (charge and current densities) in Jefimenko Equations

In Ignatowski's equations the $\rho(\mathbf r' , t')$ and the $\mathbf J(\mathbf r' , t')$ are the charges and currents that at time $t$ and position $\mathbf r' $ induce the fields at position $\...
hyportnex's user avatar
  • 18.6k
1 vote

Why/how is this crumpled wad of aluminum foil exhibiting strong magnetic repulsion against everything?

Nice video! Hypothesis: The crumpled foil is simply settling toward a position where its center of gravity is lowest, as all things tend to do in a gravity field. The ball looks “lively,” which ...
Chemomechanics's user avatar

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