Podcast
Questions and Answers
What happens to the flux density if the cross-sectional area of a magnetic field increases while the flux remains constant?
What happens to the flux density if the cross-sectional area of a magnetic field increases while the flux remains constant?
- Increases
- Doubles
- Decreases (correct)
- Remains the same
What occurs when the current through the coil of an electromagnet is reversed?
What occurs when the current through the coil of an electromagnet is reversed?
- Direction of the magnetic field remains unchanged
- Direction of the magnetic field reverses (correct)
- Magnetic field expands
- Magnetic field collapses
What term describes the ability of a material to remain magnetized after the magnetizing force is removed?
What term describes the ability of a material to remain magnetized after the magnetizing force is removed?
- Hysteresis
- Reluctance
- Retentivity (correct)
- Permeability
If the area of a magnetic flux sensor is doubled while the magnetic field strength remains the same, what effect does this have on the flux density?
If the area of a magnetic flux sensor is doubled while the magnetic field strength remains the same, what effect does this have on the flux density?
In terms of magnetic fields, what does hysteresis typically refer to?
In terms of magnetic fields, what does hysteresis typically refer to?
Flashcards
Magnetic Flux Density change with Area
Magnetic Flux Density change with Area
If the area of a magnetic field increases, while the flux remains constant, the magnetic flux density decreases.
Electromagnet Current Reversal
Electromagnet Current Reversal
Reversing the current in an electromagnet reverses the direction of its magnetic field.
Magnetic Retentivity
Magnetic Retentivity
The ability of a material to retain magnetization after the magnetizing force is removed.
Study Notes
Question 28
- If the cross-sectional area of a magnetic field increases, the flux remains the same, but the flux density changes
- The flux density will decrease
Question 29
- When the current through a coil of an electromagnet reverses, the direction of the magnetic field reverses.
Question 30
- The ability of a material to remain magnetized after removal of the magnetizing force is called retentivity.
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