Which of the following is true about soft iron and steel?
- The retentivity of soft iron is less than steel.
- The coercivity of steel is greater than soft iron.
- Soft iron and steel are both ferromagnetic.
Answer & explanation
Correct answer: option 2
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Coercivity is the intensity of the applied magnetic field required to reduce the magnetization of a given material to zero.
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Retentivity is the capacity of an object to retain magnetism after the action of the magnetizing force has ceased.
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Steel has more coercivity, and less retentivity than iron.