- Retain their magnetism for a long time.
- Prepared from hardened steel and certain alloys of nickel and cobalt.
- Alnico is widely used in electrical instruments, earphones, loud speakers, telephone reciever, small dc motor.
- Permanent magnet should not be heated up or hammered. otherwise it will be demagnetized.
- if a pair of magnets is kept, the keepers should be used and magnet should be kept facing the opposite polarity.
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