Magnetic permeability of iron is increased by its_____________________?
Correct answer: B. Alloying with cobalt
- A. Decarburising
- B. Alloying with cobalt
- C. Purification
- D. Alternate heating & cooling
Explanation
Adding cobalt to iron improves its magnetic properties, including magnetic permeability, because cobalt supports strong ferromagnetism. The other treatments do not provide this standard alloying improvement.
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