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Q.

[[1]] is used for making permanent magnets.


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Detailed Solution

Alnico is used for making permanent magnets.
A permanent magnet is an object made from a magnetised material that creates its persistent magnetic field. For example, a refrigerator magnet can hold notes on a refrigerator door; it is an example of a permanent magnet in everyday life.
Also, Alnico is an example of a permanent magnet. It is a class of iron alloys that contains aluminium, nickel, and Cobalt in addition to iron. It also contains copper and titanium. Also, Alnico alloys are ferromagnetic.
 
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