Magnetism and Electromagnetism
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| common ferromagnetic materials | iron, nickel, and cobalt
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| magnetosphere | the region of Earth's magnetic field shaped by the solar wind
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| solar wind | streams of electrically charged particles flowing at high speeds from the sun
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| magnetic field | the region around a magnet where the magnetic force is exerted
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| an aurora | the Northern Lights
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| magnetism | the force of attraction or repulsion of magnetic materials
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| temporary magnet | easily loses its magnetism
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| magnetic domain | a cluster of billions of atoms that all have magnetic fields lined up in the same way
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| unlike magnetic poles | attract each other
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| like magnetic poles | repel each other
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| magnetic field lines | never cross; they form complete loops from pole to pole; they spread out as they get farther from the magnet
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| the poles | where the magnetic force is the strongest
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| magnetic properties of a material | depend on its atomic structure
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| every magnet, regardless of its shape, | has two magnetic poles
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| a spinning electron | produces a magnetic field
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| solenoid | a coil of wire with a current
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| electromagnet | a solenoid with a ferromagnetic core
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| electromagnetism | the relationship between electricity and magnetism
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| an electric current produces | a magnetic field
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| the two ends of a solenoid | act like poles
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| the magnetic pole in the Northern Hemisphere is | in Northern Canada
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| one part of a freely swinging magnet always points | to Earth's magnetic pole in the Northern Hemisphere
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| most materials are not magnetic because | their magnetic domains are arranged randomly
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| as Earth's magnetic pole moves, | the magnetic declination in a given location will change
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| you can destroy a magnet's magnetism | by heating it or by dropping it or by striking it hard
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| since Earth produces a strong magnetic field, | Earth can make magnets
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| a magnet made from a steel paperclip is most likely | a temporary magnet
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| a compass behaves as it does | because of Earth's magnetic field
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| Earth's magnetic field can make a magnet out of an iron bar | by causing the magnetic domains to line up in the same direction
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| if you break a magnet in half | each half will be a new magnet, with both a north and south pole
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| characteristics of a magnetic field produced b a current are | it can be turned on and off; its direction can be reversed; and its strength can be changed
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| the closer together a magnet's magnetic field lines are, | the stronger the magnetic field
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| when molten material hardens into the rock on the ocean floor, | the domains of the iron it contains line up in the direction of Earth's magnetic field
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| uses of an electromagnet include | lifting heavy metal objects with a crane at a junkyard; recoding a song onto an audiotape; and recording a television show onto a videotape
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| you can increase the strength of an electromagnet's field by | using a stronger ferromagnetic material for the core; increasing the current in the solenoid; increasing the number of loops in the solenoid; and winding the coils more tightly
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
Mrs. Gordon
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