Addition of ______________ to the steel helps in increasing the residual magnetism in steel used for making magnets?
Correct answer: A. Cobalt
- A. Cobalt
- B. Nickel
- C. Tungsten
- D. Chromium
Explanation
Cobalt increases the coercivity and residual magnetism of steel, making cobalt steels suitable for permanent magnets. Chromium, nickel and tungsten may modify hardness or toughness but are not the standard answer for maximum residual magnetism here.
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