he retentivity (a property) of material is useful for the construction of__________?
Correct answer: A. permanent magnets
- A. permanent magnets
- B. transformers
- C. non-magnetic substances
- D. electromagnets
Explanation
Retentivity is the ability to retain magnetism after the magnetising field is removed, which is essential for permanent magnets. Transformer cores instead require low retentivity to reduce residual magnetism.
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