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Name the materials which are used to mak...

Name the materials which are used to make permanent magnets.

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### Step-by-Step Solution: 1. **Understanding Permanent Magnets**: Permanent magnets are materials that can maintain their magnetic properties over time without the need for an external power source. 2. **Key Property**: The primary characteristic of materials used to make permanent magnets is high retentivity. This means that these materials can retain their magnetism even after the external magnetic field is removed. 3. **Common Materials Used**: - **Alnico**: This is an alloy made from aluminum, nickel, and cobalt. It is known for its strong magnetic properties and high retentivity. ...
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