Hi, magnetic properties question please.

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The discussion focuses on the magnetic properties of loudspeaker magnets and compass needles, specifically their permeability and remanence. Loudspeaker magnets are characterized by their strong magnetic fields and minimal change in strength under external applied fields. In contrast, compass needles prioritize stability over strength, requiring sufficient remanence to maintain their directional properties. Both types of magnets are classified as permanent magnets.

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:rolleyes: Can anyone tell me the main attributes of:
a loud speaker magnet?
a compass needle?
In terms of permeability, remanence etc.
many thanks
 
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these are both intended to be permanent magnets.
compass needles do not need to be strong, just stable.
speaker magnets should be strong (even with zero applied field), but
should not change strength very much even with an external applied field.
 
many thanks
 

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