Magnetism and electromagnetismQuestion 859 of 1506

Which property lets a ferromagnetic material stay magnetized after the outside field is removed, as a permanent magnet must?

  1. Retentivity
  2. Reluctance
  3. Permittivity
  4. Reactance
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Correct answer: Retentivity

Good retentivity means the material keeps its magnetization.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.1: Permanent Magnets

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Questions last reviewed: 18 October 2026