Hi, magnetic properties question please.

AI Thread Summary
The discussion focuses on the magnetic properties of loudspeaker magnets and compass needles, specifically regarding their permeability and remanence. Loudspeaker magnets require strong magnetic fields that remain stable despite external influences, while compass needles need to be stable but do not require high strength. The importance of stability in compass needles is emphasized, contrasting with the need for strength in speaker magnets. Both types of magnets are intended to be permanent. Understanding these attributes is crucial for their respective applications.
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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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