32007904
Description
Flashcards by That Yeti Dog Person, updated more than 1 year ago
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Created by That Yeti Dog Person
over 3 years ago
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| Question | Answer |
| In general terms, a _____ is a special bar of iron that can attract and hold other pieces of iron to it. | magnet |
| _______ - The power of attraction between a magnet and iron; It's caused by the motion of electric charges; It's the force exerted by magnets when they attract or repel each other | Magnetism |
| The term _____ is used to refer to both natural and artificial magnets. | magnet |
| ______ magnets are ores that have the unusual ability to attract pieces of iron placed close to them. | Natural |
| Natural magnets are sometimes called ______. | lodestones |
| An ______ magnet is simply a man-made magnet that has all the properties of a natural magnet. | artificial |
| Straight artificial magnets are called ____ magnets. | bar |
| Curved artificial magnets are called _____ magnets. | horseshoe |
| Artificial magnets that keep their properties for long periods of time are called _____ magnets. | permanent |
| Very strong artificial magnets can be made by compressing magnetic powder under high pressure and temperature. These magnets are called _______ magnets and are used in devices such as DC motors and high-power loudspeakers. | rare earth |
| When a magnetic metal core is wrapped in a coil of wire and electric current is applied to the wire, a magnetic field forms around the core. This device is called an _________ and is used to create mechanical motion. (ex. relays & motors) | electromagnet |
| The ends of a magnet are called the _____. | poles |
| There are two opposite poles on a magnet: the _____ pole and the _____ pole. | north, south |
| The strongest force of magnetic attraction is located at the _____ of a magnet. | poles |
| The ____ is the imaginary line that's drawn through the center of a magnet. | axis |
| The _______ is the point that falls exactly halfway between the poles of a magnet. Little magnetic force is present at this spot. | neutral line |
| A piece of soft iron called a _____ joins the two ends of a horseshoe magnet. This piece helps the magnet retain its magnetism for long periods of time when it's not in use. | keeper |
| In an _______, the location of the poles depends on the direction of current flow in the wire coil. | electromagnet |
| Magnets and electromagnets always attract _____ metals. | ferrous |
| Ferrous metals are metals that contain _____. | iron |
| Copper, brass, aluminum, and some types of stainless steel are unaffected by magnets. These materials are often referred to as _______. | nonferrous |
| The forces of magnetic attraction and repulsion flow in definite directions or "lines" around a magnet. These lines of magnetic force are called ________. | magnetic flux |
| The area of space around a magnet in which the lines of force move is called a _________. | magnetic field |
| The lines of force move in a specific path around a magnet. This path is called the magnetic _____. Each line of force leaves the from north pole, makes a complete path around the magnet, then returns in the south pole. From there it goes through the magnet to the N. pole again. | circuit |
| Materials that have very little opposition to lines of force are called _____ or __________ materials. | magnetic, ferromagnetic |
| Materials that have a strong opposition to lines of force are called ________ materials. | nonmagnetic |
| The process by which an object is magnetized by the magnetic field of a magnet is called ____________. | magnetic induction |
| Three types of magnetic circuits are: ____, ______, and _____. | simple, compound, closed |
| A _____ magnetic circuit is a circuit in which all the lines of force are contained within the magnetic material. | simple |
| A _____ magnetic circuit is a circuit that consists of two or more magnetic materials | compound |
| A _____ magnetic circuit is composed entirely of magnetic material. The lines of force don't pass through an air gap or any other nonmagnetic material. | closed |
| Magnetic ____ is a measurement of the total magnetic field which passes through a given area. | flux |
| The standard unit of magnetic flux is the ______. One of these units is equal to one line of force. | maxwell |
| A large unit of magnetic flux is the ______. One of these units is equal to 100-million maxwells, or 100-million lines of force. | weber |
| _________ is the number of lines of force in a given unit area. | Flux density |
| Flux density is expressed in a unit called ____. One of these units is equal to one maxwell per square cm. | gauss |
| A large unit of flux density is a ____ which is equal to one weber per square meter. | tesla |
| ____________ is what pushes magnetic flux through a magnet. (voltage for magnets :D) | Magnetomotive force |
| The abbreviation for magnetomotive force is ____. | MMF |
| In a magnetic circuit, the materials opposition to magnetic flux is called ______. | reluctance |
| The MMF that pushes flux through an electromagnet is measured in _______. | ampere turns |
| The MMF exerted per unit of length of magnetic material is called the magnetic ________. | field intensity |
| Magnetic field intensity is represented by the letter H and is measured in units called ____________. | ampere tuens per meter |
| In any magnetic material, the relationship between the magnetic field intensity and the flux density can be illustrated by the ___________. | magnetization curve |
| A __________ is needed to demagnetize a magnetic material. | coercive force |
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