Question

5. Which of the following materials is the most suitable for making a
permanent magnet
1. cu
2. Al
3. tin
4. steel
​

Answer 1

Explanation:

The most common metals used for permanent magnets are iron, nickel, cobalt and some alloys of rare earth metals. There are two types of permanent magnets: those from “hard” magnetic materials and those from “soft” magnetic materials. “Hard” magnetic metals tend to stay magnetized over a long period......

Permanent magnets are made from "hard" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture to align their internal microcrystalline structure, making them very hard to demagnetize.

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Answer 2

Answer:

4.steel is the answer.

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