Need help doing force calculations with magnetism (between magnets)

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Calculating the forces between a permanent magnet and an electromagnet is complex due to various factors, including the strength of each magnet, their distance apart, and the magnetic permeability of the medium between them. The discussion highlights that while ideal calculations can be made using magnetic pole moments and distances, real-world scenarios introduce complications, particularly with geometry and uniform magnetic fields. It is noted that in a uniform magnetic field, such as that of the Earth, the net force on a magnet is zero, although torque can cause alignment. The conversation also touches on the misconception that magnets will always attract or repel each other, emphasizing that the interaction depends on the specific conditions and configurations. Ultimately, the need for a straightforward equation to calculate the force in practical situations remains unresolved.
  • #31
CCatalyst said:
How does that relate to this particular case?
It doesn't. You had also asked about how refrigerator magnets work, and my answer was to that specific question.
CCatalyst said:
Also I realize that other materials can interfere with magnetic fields and seem to block them out. Fro example, I've seen magnets where they attach to a filing cabinet or refrigerator you can see the sticker on the side facing you, usually with an advertisement on it. Flip it around however, it falls like a rock. So what is going on in that case

CCatalyst said:
All I'm asking is are there other materials besides superconductors that can deflect magnetic fields the same way the meissner effect does?
My understanding is the meissner effect is exclusive to superconductors. A superconductor is rendered nearly perfectly diamagnetic by virtue of the meissner effect, however, a wide range of diamagnetic materials exist.
 
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