Podcast
Questions and Answers
What is the term used to describe the lagging of magnetic flux density (B) behind the magnetic field intensity (H) when the current is decreased from its saturation value?
What is the term used to describe the lagging of magnetic flux density (B) behind the magnetic field intensity (H) when the current is decreased from its saturation value?
Hysteresis
What do we call the property where, after removing the magnetizing force (H), a magnetic material retains a small amount of magnetism?
What do we call the property where, after removing the magnetizing force (H), a magnetic material retains a small amount of magnetism?
Residual magnetism (Br)
What term is used to describe the negative value of magnetic field intensity (H) required to reduce residual magnetism to zero in a ferromagnetic material?
What term is used to describe the negative value of magnetic field intensity (H) required to reduce residual magnetism to zero in a ferromagnetic material?
Coercive force (Hc)
Describe the behavior of magnetic flux density (B) when the value of magnetic field intensity (H) is decreased in the opposite direction after reaching saturation in a ferromagnetic material.
Describe the behavior of magnetic flux density (B) when the value of magnetic field intensity (H) is decreased in the opposite direction after reaching saturation in a ferromagnetic material.
What is the defining characteristic of ferromagnetic materials when the applied field is removed?
What is the defining characteristic of ferromagnetic materials when the applied field is removed?
Why are iron, nickel, cobalt, gadolinium, and dysprosium known as ferromagnetic materials?
Why are iron, nickel, cobalt, gadolinium, and dysprosium known as ferromagnetic materials?
What are the two types of ferromagnetic materials mentioned in the text?
What are the two types of ferromagnetic materials mentioned in the text?
What are the key properties of soft magnetic materials mentioned in the text?
What are the key properties of soft magnetic materials mentioned in the text?
Define magnetic hysteresis.
Define magnetic hysteresis.
What is a hysteresis loop and what information can be obtained from it?
What is a hysteresis loop and what information can be obtained from it?
Explain the concept of magnetic saturation in the context of hysteresis.
Explain the concept of magnetic saturation in the context of hysteresis.
How does the hysteresis loop change as the current in the circuit is varied?
How does the hysteresis loop change as the current in the circuit is varied?
Flashcards
Retentivity
Retentivity
The property of a magnetic material where it retains a small amount of magnetism after the magnetizing force is removed.
Hysteresis
Hysteresis
The lagging of magnetic flux density (B) behind the magnetic field intensity (H) when the current is decreased from its saturation value.
Coercivity
Coercivity
The negative value of magnetic field intensity (H) required to reduce residual magnetism to zero in a ferromagnetic material.
Behavior of Magnetic Flux Density in Ferromagnetic Materials
Behavior of Magnetic Flux Density in Ferromagnetic Materials
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Ferromagnetic Materials
Ferromagnetic Materials
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Soft Magnetic Materials
Soft Magnetic Materials
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Hard Magnetic Materials
Hard Magnetic Materials
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Magnetic Saturation
Magnetic Saturation
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Magnetic Hysteresis
Magnetic Hysteresis
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Hysteresis Loop
Hysteresis Loop
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Examples of Ferromagnetic Materials
Examples of Ferromagnetic Materials
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Study Notes
Ferromagnetic Materials
- Hysteresis is the lagging of magnetic flux density (B) behind the magnetic field intensity (H) when the current is decreased from its saturation value.
Retentivity and Coercivity
- Retentivity is the property where a magnetic material retains a small amount of magnetism after the magnetizing force (H) is removed.
- Coercivity is the negative value of magnetic field intensity (H) required to reduce residual magnetism to zero in a ferromagnetic material.
Behavior of Magnetic Flux Density
- When the value of magnetic field intensity (H) is decreased in the opposite direction after reaching saturation in a ferromagnetic material, the magnetic flux density (B) decreases, but not immediately, resulting in a lag behind the magnetic field intensity (H).
Characteristics of Ferromagnetic Materials
- Ferromagnetic materials retain magnetism even when the applied field is removed.
- Iron, nickel, cobalt, gadolinium, and dysprosium are known as ferromagnetic materials due to their ability to be magnetized and retain magnetism.
Types of Ferromagnetic Materials
- There are two types of ferromagnetic materials: soft magnetic materials and hard magnetic materials.
Properties of Soft Magnetic Materials
- Soft magnetic materials have high permeability, low coercivity, and low retentivity, making them suitable for applications where a strong magnetic field is required.
Hysteresis Loop and Magnetic Saturation
- Magnetic hysteresis is the lagging of magnetic flux density (B) behind the magnetic field intensity (H) due to energy loss.
- A hysteresis loop is a graph of magnetic flux density (B) versus magnetic field intensity (H), providing information on the energy loss and magnetic properties of a material.
- Magnetic saturation is the maximum value of magnetic flux density (B) achievable in a material, reached when the material cannot be further magnetized.
- The hysteresis loop changes as the current in the circuit is varied, resulting in a different energy loss and magnetic properties.
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Description
Test your knowledge on the concepts of hysteresis and residual magnetism in magnetic materials. Understand the relationship between current, magnetic flux saturation, and magnetization curves.
