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Module 17 in the Syllabus

Magnetism Concept Cards
Chapter from the Wisebridge Learning System for Physics

Magnetism Practice Items
Problem set for Magnetism in PDF format

Answer Key
Answers and explanations

Magnetism Images
Image gallery for study with links to larger teaching JPEGs for classroom presentation

Question Drill for Magnetism
Conceptual Vocabulary Self-Test

Basic Terms Crossword Puzzle

Basic Puzzle Solution

Conceptual Vocabulary
Magnetic fieldMagnetic fields permeate space around electric currents, magnetic dipoles, and changing electric fields, exerting a magnetic force on moving electric charges and magnetic dipoles.
Magnetic dipoleA closed circulation of electric current creates a magnetic dipole.
TeslaThe tesla is the SI derived unit of magnetic field.
Ampère's circuital lawAmpère's circuital law relates the circulating magnetic field in a closed loop to the electric current passing through the loop.
FerromagnetismFerromagnetism is defined as the phenomenon by which materials, such as iron, in an external magnetic field become magnetized and remain magnetized for a period after the material is no longer in the field.
Lorentz forceThe Lorentz force is the force exerted on a charged particle in an electromagnetic field refering to the combined effects of any electric field and magnetic field.
Magnetic constantThe magnetic constant is equal to the vacuum permeability, also known as the permeability of free space.
Magnetic momentThe magnetic dipole moment is a measure of the strength of a magnetic source.
ParamagnetismParamagnetism is a form of magnetism which occurs only in the presence of an externally applied magnetic field, but unlike ferromagnetism, does not result in any retained magnetization.
DiamagnetismResulting from changes in the orbital motion of electrons, diamagnetism is a weak repulsion from a magnetic field only exhibited by a substance in the presence of an externally applied magnetic field.
ElectromagnetAn electromagnet is a type of magnet in which the magnetic field is produced by the flow of an electric current.
GalvanometerA galvanometer is an electromechanical transducer that produces a rotary deflection, through a limited arc, in response to electric current flowing through its coil.
MagnetostaticsMagnetostatics is the study of static magnetic fields.
MagnetizationMagnetization is a property of some materials that describes to what extent they are affected by magnetic fields and what magnetic field the material itself creates.
CyclotronA cyclotron is a type of particle accelerator in which a perpendicular magnetic field causes the particles to spiral almost in a circle so that they re-encounter the accelerating voltage many times.
Biot-Savart lawThe Biot-Savart Law is an equation in electromagnetism that describes the magnetic field vector B in terms of the magnitude and direction of the source electric current, the distance from the current, and the magnetic permeability.
PermeabilityPermeability is the degree of magnetization of a material that responds linearly to an applied magnetic field.
Curie pointThe Curie point of a ferromagnetic material is the temperature above which it loses its characteristic ferromagnetic ability.
SaturationSaturation is the state when the material cannot absorb a stronger magnetic field, such that an increase of magnetization force produces no significant change in magnetic flux density.
RemanenceRemanence is the magnetization left behind in a medium after an external magnetic field is removed.
GaussThe gauss is the cgs unit of magnetic field.
Guiding centerThe guiding center is a point around which the motion in a magnetic field of an electrically charged particle can be treated as the superposition of a relatively fast circular motion and a relatively slow drift of this point.
GyroradiusThe gyroradius defines the radius of the circular motion of a charged particle in the presence of a uniform magnetic field.
Weiss domainsWeiss domains are small areas in a crystal structure of a ferromagnetic material with uniformly oriented magnetic momenta.
CoercivityThe coercivity of a ferromagnetic material is the intensity of the applied magnetic field required to reduce the magnetization of that material to zero after the magnetization of the sample has been driven to saturation.
OerstedThe oersted is the unit of magnetic field strength in the CGS electromagnetic system.
Electromagnetic shieldingElectromagnetic shielding is the process of limiting the flow of electromagnetic fields between two locations, by separating them with a barrier made of conductive material.
Dynamo theoryThe dynamo theory proposes a mechanism by which a celestial body such as the Earth generates a magnetic field.
Geomagnetic reversalA geomagnetic reversal is a change in the orientation of Earth's magnetic field such that the positions of magnetic north and magnetic south become interchanged.
Solenoidal vector fieldA solenoidal vector field is a vector field with divergence zero.
Magnetic mirrorA magnetic mirror is a magnetic field configuration where the field strength changes when moving along a field line resulting in a tendency for charged particles to bounce back from the high field region.
Advanced terms that may appear in context in MCAT passages
Bohr magnetonThe Bohr magneton is a physical constant of magnetic moment in atomic physics.
AntiferromagnetismIn materials that exhibit antiferromagnetism the spins of electrons align in a regular pattern with neighboring spins pointing in opposite directions.
Néel temperatureThe Néel temperature is the temperature at which an antiferromagnetic material becomes paramagnetic.
Meissner effectThe Meissner effect is the expulsion of a magnetic field from a superconductor.
SuperdiamagnetismSuperdiamagnetism is a phenomenon occurring in certain materials at low temperatures, characterised by the complete absence of magnetic permeability and the exclusion of the interior magnetic field.
SuperparamagnetismSuperparamagnetism is a phenomenon by which magnetic materials may exhibit a behavior similar to paramagnetism even when at temperatures below the Curie or the Néel temperature.
Exchange biasExchange bias occurs in bilayers (or multilayers) of magnetic materials where the hard magnetization behavior of an antiferromagnetic thin film causes a shift in the soft magnetization curve of a ferromagnetic film.
MetamagnetismMetamagnetism is a physical state of matter characterized by a superlinear increase of magnetization over a narrow range of applied magnetic field.
Spin glassA spin glass is a disordered material exhibiting high magnetic frustration.

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