MAGNETIC MATERIALS Flashcards
What is the definition of magnetic materials?
Materials that can be magnetized or that respond to a magnetic field.
List the three main types of magnetic materials.
Diamagnetic, paramagnetic, and ferromagnetic.
True or False: Diamagnetic materials are repelled by magnetic fields.
True
Fill in the blank: __________ materials have a weak attraction to magnetic fields.
Paramagnetic
What characterizes ferromagnetic materials?
They have a strong attraction to magnetic fields and can retain magnetization.
Which type of magnetism is exhibited by iron, nickel, and cobalt?
Ferromagnetism
What happens to the magnetic domains in a ferromagnetic material when it is magnetized?
The magnetic domains align in the direction of the magnetic field.
True or False: In diamagnetic materials, the magnetic moments are aligned in the opposite direction to the applied magnetic field.
True
What is the susceptibility of diamagnetic materials?
Negative susceptibility.
What is the susceptibility of paramagnetic materials?
Positive but small susceptibility.
Define magnetic permeability.
The ability of a material to conduct magnetic lines of force.
What is the term for the temperature above which ferromagnetic materials lose their magnetism?
Curie temperature.
Fill in the blank: __________ is a measure of how much a material can be magnetized in an applied magnetic field.
Magnetic susceptibility
What is the primary difference between hard and soft magnetic materials?
Hard magnetic materials retain magnetization, while soft magnetic materials do not.
True or False: Soft magnetic materials are used in transformer cores.
True
What type of magnetic material is used to make permanent magnets?
Hard magnetic materials.
What is the role of magnetic hysteresis in magnetic materials?
It describes the lag between the change in magnetization and the applied magnetic field.
What is a common application of paramagnetic materials?
Used in magnetic resonance imaging (MRI).
Fill in the blank: The __________ of a material indicates its response to an applied magnetic field.
Magnetic susceptibility
Name one example of a diamagnetic material.
Bismuth.
True or False: All materials can be classified as either diamagnetic, paramagnetic, or ferromagnetic.
True
What is the effect of temperature on ferromagnetic materials?
Increasing temperature can lead to a loss of magnetism above the Curie temperature.
What are magnetic domains?
Regions within a material where the magnetic moments are aligned.
Which type of magnetism is characterized by a lack of permanent magnetism?
Paramagnetism.
