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State, briefly, an efficient way of maki...

State, briefly, an efficient way of making a permanent magnet.
Write two properties to select suitable materials for making permanent magnets.

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If an iron rod is burried inside the earth, along the north-south-direction. After some days, the rod becomes a magnet. It is possible only when the earth itself behaves like a magnet.
The two properties of permanent magnet are as :
(i) Its retentivity is very high.
(ii) Its hysteresis loss is very high.
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