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What is the life of permanent magnet and what type of
magnet is used in speakers?
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Life of a magnet is the time through which it can retain its
magnetism. For a permanent magnet, its domains are always
aligned properly; so its life is theoretically infinite.
However, in practical case, earths magnetism tends to induce
polarities according to the alignment of the magnet. Still
the life is very high(several years or centuries if left
undisturbed)
For obvious reasons, a permanent magnet is normally used in
speakers
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General Physics 
