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physical science chp. 18


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magnetic field
show the strength and direction of magnetic forces
the rotating electromagnet in an electric motor
strongly attracted to magnets
Curie temperature
the temperature at which a permanent magnet loses its magnetic field
step-up transformer
a series of coils that uses induction to produce a higher voltage
lines of force
show the direction the electrical force will move a positive charge
microscopic regions of materials that may be lined up to produce a magnetic field of force
a device that uses magnetic fields to convert mechanical energy into electrical energy
materials like lodestone
(made of two different types of iron ions)
direct current (DC)
an electric current that flows in only one direction
alternating current(AC)
an electric current that regularly changes the direction of its flow
slightly attracted to magnets
step-down transformer
a series of coils that uses induction to produce a lower voltage
geographic north pole
point at the "top of the world" where the axis of the Earth spins
a switch used to turn solenoids on or off
magnetic north pole
point in Canada where the earth's magnetic flield is concentrated - see geographic north pole
hertz (Hz)
the unit of frequency; one cycle per second
superconducting magnet
a magnet made from special materials and kept at extremely low temperatures
coiled wires used to form a magnet
magnetic poles
the two areas of concentrated magnetic force on a magnet
electric field
the strengths and directions of the electrical force at every point around the electrode

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