Indicate which of the following material does not retain magnetism permanently
Correct answer: A. Soft iron
- A. Soft iron
- B. Stainless steel
- C. Hardened steel
- D. None of the above
Explanation
Soft iron has low retentivity, so its magnetism disappears nearly completely when the magnetising field is removed. Hardened steel is commonly used for permanent magnets because it retains magnetism strongly.
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