Chapter 11 Terms Flashcards
Any object that possesses or can generate a magnetic field.
Magnet
One of the areas of concentrated magnetic field lines on a magnet’s surface.
Magnetic pole
Any object or particle with magnetic properties
Magnetic dipole
The region of influence surrounding a magnet.
Magnetic field
Law stating that opposite magnetic poles attract and like magnetic poles repel.
Law of magnetism
A form of magnetism that results from the net difference of a mixture of opposed magnetic dipole particles in a natural magnet.
Ferrimagnetism
Natural tendency of all matter to weaken a magnetic field, especially in the absence of other kinds of magnetism.
Diamagnetism
Exhibited by materials that are only slightly attached to magnets.
Paramagnetism
A microscopic region of a metal where most of the magnetic dipoles are oriented in a single direction.
Domain (magnetic)
A ferromagnetic material containing enogh aligned magnetic domains to give it a permanent magnetic character.
Permanent magnet.
Phenomenon observed in materials that are highly permeable to magnetic lines of force because their magnetic domains align with the field.
Ferromagnetism
Temperature above which a permanent magnet loses its ferromagnetic properties.
Curie temperature
Point representing the intersection of the earth’s axis with its surface in the northern hemisphere.
Geographic north pole
Slowly drifting point on the earth’s surface in the northern hemisphere.
Magnetic north pole
Magnetic field of the earth.
Geomagnetic field
Rule stating that the direction of the magnetic field surrounding a current carrying conductor is indicated by the direction the fingers wrap around the conductor.
Right-hand rule of magnetism
Electromagnetic device consisting of a cylinder formed by many wraps of wire.
Solenoid
Solenoid with a ferromagnetic core
Electromagnet
Electricity generated from a charging magnetic field or a magnetic field generated by an electrical current.
Electromagnetic induction
Part of an electrical motor or generator that rotates.
Rotor
Stationary part of an electrical motor or generator that contains the magnets or induction coils that surround the rotor.
Stator
Electrical current that periodically changes direction at a specific frequency
Alternating current
SI unit of frequency
Hertz
Mechanical device that converts fluid motion into rotary motion as the fluid passes through propeller-like blades
Turbine
Device that converts the alternating current inside a DC generator to a DC output or converts a DC supply to alternating current inside a DC motor.
Commutator
One of the many curved blocks of conductive material that ride on a rotor commutator to connect the rotor coils to the external electrical circuit.
Brush (electrical)
A machine that converts electrical energy into rotational mechanical motion
Motor
An electrical device used in AC circuits consisting of two coils of wire wound on a single ferromagnetic core.
Transformer
Electromagnet made of a material that has zero resistance to current flow.
Superconducting magnet
