Magnetic dipole radiation

In summary, magnetic dipole radiation (MD radiation) is produced by a rotating bar magnet, but only at very fast rotation speeds. MD radiation is similar to electromagnetic radiation (ED radiation), but has a magnetic field (B) in the plane of the radius vector (r) and an oscillating dipole, while ED radiation has an electric field (E) in that plane. A rotating magnet would produce circular polarization along its axis of rotation and plane polarization perpendicular to the axis. The conditions under which a rotating magnetic dipole moment will radiate are still being studied, and it is currently unknown how the rotation frequency (w) and magnetic dipole moment (M) are related to allow for radiation. Thorough analysis of the power radi
  • #1
quantumfireball
91
0
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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  • #2
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.
 
  • #3
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.
 

1. What is magnetic dipole radiation?

Magnetic dipole radiation is a type of electromagnetic radiation that results from the acceleration of electric charges. It is characterized by a changing magnetic field and is often associated with moving charged particles.

2. How is magnetic dipole radiation different from other types of radiation?

Magnetic dipole radiation is unique because it involves a changing magnetic field, whereas other types of radiation, such as electric dipole radiation, involve a changing electric field. Additionally, magnetic dipole radiation has a specific directional pattern and a different wavelength range compared to other types of radiation.

3. What are some common sources of magnetic dipole radiation?

Some common sources of magnetic dipole radiation include electric motors, antennas, and astronomical objects such as pulsars and black holes. Any object that contains moving charged particles can produce magnetic dipole radiation.

4. How does magnetic dipole radiation affect our daily lives?

Magnetic dipole radiation is used in many technologies that we use on a daily basis. For example, it is used in radio and television broadcasting, as well as in wireless communication devices such as cell phones and Wi-Fi routers. It is also important in understanding the behavior of celestial objects and the formation of our universe.

5. Can magnetic dipole radiation be harmful?

In general, magnetic dipole radiation is not harmful to human health. However, exposure to large amounts of radiation, such as from certain medical procedures or nuclear accidents, can have negative effects on the body. It is important to follow safety guidelines and regulations to minimize potential harm from magnetic dipole radiation.

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