Materials that retain a large part of their...

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Materials that retain a large part of their magnetization, after the magnetizing force is removed are considered to be permanent magnets. What characteristic of the material is responsible for this permanence?

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🔍 Key Concepts

• Magnetic hysteresis and what it means on a B-H (magnetization) curve • Difference between materials that easily lose magnetism vs. those that keep it (permanent magnets) • How the area/size of the hysteresis loop relates to energy loss and magnetic ‘memory’

💭 Think About

• Think about whether a permanent magnet should keep or quickly lose its magnetization once the magnetizing force is removed. Which property supports that? • Ask yourself: does a material with more pronounced hysteresis tend to remember its previous magnetization more, or less? • Consider whether ductility (ability to deform) is directly related to magnetic permanence, or if it’s mostly a mechanical property.

✅ Before You Answer

• Make sure you understand that hysteresis is about how a material’s magnetization lags behind the applied magnetic field. • Check which option describes a material that has a strong magnetic memory after the external field is removed. • Eliminate choices that only describe mechanical properties and not magnetic behavior.

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