Does a Rotating Bar Magnet Emit Magnetic Dipole Radiation?

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SUMMARY

A rotating bar magnet does emit magnetic dipole (MD) radiation, but only at high angular velocities. The characteristics of MD radiation are similar to electric dipole (ED) radiation, with the magnetic field (B) in the plane of the radius (r) and an oscillating dipole. Specifically, a rotating magnet generates circular polarization along its axis of rotation and plane polarization perpendicular to it. Understanding the conditions under which a rotating magnetic dipole moment radiates involves analyzing the relationship between the magnetic dipole moment (M) and angular frequency (ω).

PREREQUISITES
  • Understanding of electromagnetic radiation principles
  • Familiarity with magnetic dipole moments
  • Knowledge of angular frequency and its implications in physics
  • Basic concepts of polarization in electromagnetic waves
NEXT STEPS
  • Research the mathematical derivation of magnetic dipole radiation
  • Study the relationship between magnetic dipole moment (M) and angular frequency (ω)
  • Explore the characteristics of circular and plane polarization in electromagnetic radiation
  • Learn about the power radiated by oscillating dipoles in electromagnetic theory
USEFUL FOR

Physicists, electrical engineers, and students studying electromagnetism, particularly those interested in the behavior of rotating magnetic dipoles and their radiation properties.

quantumfireball
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What is the nature of magnetic dipole radiation?
Does a rotating bar magnet give rise to electromagnetic radiation(magnetic dipole radiation to be more specific)??
 
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A rotating bar magnet would produce MD radiation, but it would have to be rotating very fast. MD radiation is just like ED radiation, but has B in the plane of r and an oscillating dipole, while ED has E in that plane. A rotating magnet would produce circular polarization along the axis of rotation, and plane polarization perpendicular to the axis.
 
Im currently stuck on a related problem. I cannot figure out the conditions under which a rotation magnetic dipole moment will radiate.

If I know a MD M is rotating with angular frequency w, how would you find the conditions under which it will radiate? I know if you went into it thoroughly you can figure out the power radiated by explicitly finding E and B to find the radiative component of S, but I still don't know the relationship between M and w that allows it to radiate.
 

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