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51 Cards in this Set
- Front
- Back
Imparting a charge by bringing a charged object near, but not touching, a neutral object is charging by ____. |
Induction |
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What is the stream of charged particles that emanates from the sun called? |
Solar wind |
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The extent to which a material can channel or absorb lines of magnetic flux is the material's _____. |
Permeability |
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The two points on a magnet where its magnetism is concentrated are the ____. |
Poles |
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If two charged objects have a 125 N force between them when they are 3.00 m apart, what force exists between them when they are 15.0 m apart? |
5.00 N |
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And imaginary circle around the earth halfway between the magnetic poles is the _____. |
Magnetic equator |
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What methods are magnetization? |
Contact, electricity, and induction. |
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A material that has only one unpaired electron per atom and is weakly attracted to magnets is _____. |
Paramagnetic |
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An electric field in which the strength is evenly distributed throughout, as between plates of opposite charge, is a _____. |
Uniform field |
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The most important cause of magnetism in magnetic materials is ____. |
Electron spin |
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An excess of electrons causes a _____ charge. |
Negative |
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An object that has no overall electrical charge is _____. |
Neutral |
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The amount by which a compass needle deviates from true north is the angle of _____. |
Declination |
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What phenomenon causes a vertical compass to point downward in the Northern Hemisphere? |
Inclination |
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If the strength of a magnet doubles, what happens to the force between it and another magnet? |
Doubled |
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If the distance between two magnets is halved, what happens to the strength of the magnetic force between them? |
Quadrupled |
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In a lightning bolt, the downward flow of charge from the cloud attracts an upward flow charge from the ground called the _____. |
Positive streamer |
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The boundary of the magnetosphere is the ____. |
Magnetopause |
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Which law states that the total charge is the same before and after an interaction? |
Law of conservation of charge |
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Which law states that like poles repel and unlike poles attract? |
Law of magnetic poles |
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Quadrupling the current increases the strength of an electromagnet by a factor of ____. |
16 |
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If the number of loops in a electromagnet's coil is doubled, the strength of the electromagnet is ____. |
Doubled |
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Electric charges are considered _____ electricity. |
Static |
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Lines connecting points of equal inclination are ____ lines. |
Isoclinic |
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Our understanding of how magnets work depends upon the ____ theory. |
Domain |
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According to the law of electric charges, opposite charges ____ each other. |
Attract |
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When a charged ball is touched to the knob of an electroscope, charge is transferred from the ball to the electroscope through _____. |
Conduction |
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The two vast, doughnut-shaped belts of high-speed particles trapped in Earth's magnetic field are the ____ radiation belts. |
Van Allen |
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The flow of charge from one place to another is ____. |
Current |
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The north magnetic pole of the earth is a "_____-seeking" pole. |
South |
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The region surrounding a charged object in which other objects are attracted or repelled by electric force is an electric _____. |
Field |
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A group of aligned atoms having a single magnetic field is a ____. |
Domain |
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The study of the nature, behavior, and uses of static electricity and related phenomena is ____. |
Electrostatics |
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A magnet made from a magnetically hard substance is a ____ magnet. |
Permanent |
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Simple device that detects small electric charges |
Electroscope |
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Early device used to store an electric charge |
Leyden jar |
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Most common electrostatic generator |
Van de Graaff generator |
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Protects buildings and other structures from lightning strikes |
Lightning rod |
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Form of magnetite that is a naturally occurring magnet |
Lodestone |
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Compass that swings vertical to reveal the angle at which lines of flux enter the earth |
Dipping needle |
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What is the force that changes the path of a charged particle moving through a magnetic field? |
Deflecting force |
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What is the name for the temperature above it which a ferromagnetic material has no domains? |
Curie point |
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What is "dry writing" that uses electric charges to reproduce images on paper? |
Xerography |
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In what book did William Gilbert propose that Earth has a magnetic field? |
De Magnete or On the Magnet |
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What is the display of shimmering light formed by high-speed particles spiraling into the upper atmosphere and crashing into air molecules? |
Aurora |
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What is the general term for a modern device used to store electric charge? |
capacitor |
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Why do the hairs on your head stand up straight and apart from each other if you are given a strong enough charge? |
Like charges repel |
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What is the SI unit of charge called? |
Coulomb |
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What time refers to the interactions between electrons and other charged particles? |
Electricity |
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What is the process of diverting unwanted electrical charge directly into the earth? |
Grounding |
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ESSAY: Explain why a Faraday suit, which encloses the wearer's entire body in a mesh of conducting material, can protect someone from being electrocuted while working on electric power lines? |
Electric charges always move to the outside of a charged object. Even when a strong electric charge occurs while wearing a Faraday suit, the charge will remain on the outside instead of shocking the wearer inside. |