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BJU Physical Sci 11

BJU Physical Science - Ch 11

QuestionAnswer
An electrical current that periodically changes direction at a specific frequency. alternating current
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
The temperature at which a permanent magnet loses its magnetic field. Curie temperature
The natural tendency of all matter to weaken a magnetic field, especially in the absence of other kinds of magnetism. These materials generate a magnetic field that opposes the external magnetic field. diamagnetism
Microscopic regions of materials that may be lined up in a single direction to produce a magnetic field of force. Domains
A solenoid with a ferromagnetic core. electromagnet
Electricity generated from a changing magnetic field or a magnetic field generated by an electrical current. electromagnetic induction
A form of magnetism that results from the net difference of a mixture of opposed magnetic dipole particles in a natural magnet, such as a lodestone. ferrimagnetism
A material that naturally has ferromagnetism. ferromagnetic material
The point representing the intersection of the earth’s axis with its surface in the northern hemisphere. All lines of longitude pass through this point. Also called true north. geographic north pole
The SI unit of frequency’ one cycle per second. hertz
A law that says like magnetic poles attract and opposite magnetic poles repel. law of magnetism
Any object or particle with magnetic properties, i.e., having two magnetic poles. All magnets are magnetic dipoles. magnetic dipole
Exhibited by materials that are only slightly attracted to magnets. It varies with temperature and does not produce permanent magnets. paramagnetism
A ferromagnetic material containing enough aligned magnetic domains to give it a permanent magnetic character. permanent magnet
Part of an electrical motor or generator that rotates. Depending on the application, it may include permanent magnets or electromagnets. rotor
An electromagnetic device consisting of a cylinder formed by many wraps of wire. When carrying a current, a strong magnetic field forms within the cylinder of wire. Solenoids
The stationary part of an electrical motor or generator that contains the magnets or induction coils that surround the rotor. stator
A magnet made from special materials that have zero resistance to current flow and kept at extremely low temperatures. superconducting magnet
An electrical device used in AC circuits consisting of two coils of wire wound on a single ferromagnetic core, usually shaped like a hollow square. It can either raise or lower the voltage in an AC circuit. transformer
Any mechanical device that converts fluid motion into rotary motion as the fluid passes through propeller-like blades. turbine
A device that converts the alternating current inside a DC generator to a DC output or converts a DC supply to an alternating current inside a DC motor. commutator
The phenomenon observed in materials that are highly permeable to magnetic lines of force because their magnetic domains align with the field, reinforcing it. ferromagnetism
The magnetic field of the earth. geomagnetic field
An object that possesses or can have a magnetic field. magnet
The region of influence surrounding a magnet, where it exerts a magnetic field which is shown by lines of force. magnetic field
The slowly drifting point on the earth’s surface in the northern hemisphere where the earth’s magnetic field lines are most concentrated and nearly vertical as they pass into the earth’s interior; the south magnetic pole of the earth’s geomagnetic field. magnetic North pole
One of two areas of concentrated magnetic field lines on a magnet’s surface. The field direction for each pole is the opposite of the other. magnetic pole
A machine that converts electrical energy into rotational mechanical motion. motor
Rule that the direction of the magnetic field surrounding a current-carrying conductor is indicated by the direction the right hand fingers wrap around the conductor, the thumb pointing in the direction of the conventional current flow. right-hand rule of magnetism
Created by: heidio on 2008-12-21



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