Magnetism Flashcards
Consists of
wire wrapped around an iron
core.
Electromagnets
Materials
that are unaffected by
magnetic field.
Nonmagnetic
Materials that are
weakly repelled by magnetic
fields.
Diamagnetic
They cannot be artificially
magnetized, and they are not
attracted to a magnet.
•Ex. Copper, beryllium, lead
Diamagnetic
They are slightly attracted to a
magnet and loosely influence by
an external magnetic field.
• Ex. Gadolinium -contrast agents
used in MRI, platinum,
aluminum
Types of M
Paramagnetic
Materials that lie
somewhere between
ferromagnetic and nonmagnetic.
Paramagnetic
fundamental property of some forms of matter
magnetism
A charge particle in motion also creates ?
magnetic field
• In radiologic sciences, understanding magnetism is important in
____which uses powerful magnetic fields to
create images of the human body.
magnetic resonance imaging
is a vector field
that describes the magnetic influence of electrical currents
and magnetized materials.
magnetic field
The motion of____
and their spins, in opposite direction, produce tiny magnetic fields.
orbital electrons
Magnetic field is also created by a ?
moving electric charge
Magnetic field (B) is measured jn
Gauss (G)
Magnetic field is ____ (magnetic dipole)
dipolar (has north and south pole)
are regions at the end of the magnet where the magnetic field are strongest
poles
Law of Magnetism
Like magnetic poles repel and unlike magnetic poles attract.
is a region
created by the accumulation of
many atomic magnets with their
dipoles aligned.
magnetic domain
Magnetic domain -This means that the individual
magnetic moments of the atoms
are aligned with one another,
and they point in the ___.
same
direction
Magnetic force is caused by ?
motion of charges
is the consequence of the electromagnetic force
magnetic force
Two objects containing charge with the same direction of motion have
a _____ force between them.
• Similarly, objects with charge moving in opposite directions have a ___force between them
magnetic attraction; repulsive
As moving charges create magnetic fields, so they
experience forces from magnetic fields generated by other materials. The magnitude of the force experienced by a particle traveling in a magnetic field depends on the charge of the particle (q), the velocity of the particle(v), the strength of the field(B), and, importantly, the angle between their relative directions(θ):
Lorentz Force
____ (q); _____(B)
charge;magnetic field
unit of magnetic field strength
Tesla
Types of magnets (7)
- Natural magnets
- Permanent magnets
- Electromagnets
- Nonmagnetic
- Diamagnetic
- Paramagnetic
- Ferromagnetic
Example is the Earth.
_____ has been
exposed to Earth’s
magnetic field for a long
time and has developed a
strong magnetism.
natural magnets;Lodestone
Usually made of iron.
Made by aligning their
domains in the field of an
electromagnet.
Permanent magnets
Materials that lie
somewhere between
ferromagnetic and nonmagnetic.
Paramagnetic
contrast agents
used in MRI,
gadolinium example of paramagnetic
Strongly
attracted to magnets or
magnetic materials and usually
can be permanently magnetized
by exposure to a magnetic field.
Ex. Alnico –combination of
aluminum, nickel, cobalt
Ferromagnetic
–combination of
aluminum, nickel, cobalt
Alnico example of ferromagnetic
