Residual magnetism in steel for magnets is increased by the addition of__________________?
Correct answer: B. Cobalt
- A. Nickel
- B. Cobalt
- C. Tungsten
- D. Chromium
Explanation
Cobalt raises the retentivity, or residual magnetism, of steel and is therefore used in permanent-magnet alloys. Nickel can improve toughness and corrosion resistance, but it is not the principal answer here.
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