Which material is described as having high retentivity?

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Multiple Choice

Which material is described as having high retentivity?

Explanation:
Retentivity is how much magnetization a material keeps after the external magnetic field is removed. A material with high retentivity remains magnetized for a long time. Permanent magnets are designed to retain most of their magnetization, so they have high retentivity. Soft iron, while it is easy to magnetize because it’s highly permeable, loses most of that magnetization once the field is gone, so its retentivity is low. Copper and aluminum are nonmagnetic conductors and do not hold magnetization after the field is removed. So the material described as having high retentivity is permanent magnets.

Retentivity is how much magnetization a material keeps after the external magnetic field is removed. A material with high retentivity remains magnetized for a long time. Permanent magnets are designed to retain most of their magnetization, so they have high retentivity. Soft iron, while it is easy to magnetize because it’s highly permeable, loses most of that magnetization once the field is gone, so its retentivity is low. Copper and aluminum are nonmagnetic conductors and do not hold magnetization after the field is removed. So the material described as having high retentivity is permanent magnets.

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