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FULL NAME ________________________________
CLASS NUMBER ______
Magnetism Homework #1 (20 pts total) (1/3 pt each)
Instructions: 1) Answer all questions on this ditto in ink
2) Math Problems- show work, math units, and circle the final answer
3) = Double (1pt), (T)= Triple (1 ½ pts.)
4) Read only the assigned pages in a chapter.
5) Fill-Ins - use only 1 word for each blank. 6) True-False - write the word; not the letter
7)Comparing answers and helping other students with homework are Honor Code violations
 READING – Read Chapter 19 (Pgs.612-639) Answer all questions that follow.
Sect 1 (Pg. 612-619)
1) Magnetic rocks discovered by the Greeks contained the mineral called ________________. Because
they would point to the North star, the rocks became known as _________STONES.
2) True False Like magnetic poles will repel one another, but unlike poles will attract.
3) True False The magnetic force is found everywhere around a magnet; not just at the poles.
4) Define “ferromagnetic” _______________________________________________________________
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5) What do the metals iron, cobalt, and nickel have in common? _________________________________
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6) The magnetism in atoms happens because of the ‘spin’ of the ________________s in the atom. When
the spins in many atoms are aligned and do not cancel one another, these groups of atoms form areas
called MAGNETIC __________________ which act like tiny little magnets inside the material.
7) Describe 2 ways by which a ferromagnetic material can be made into a permanent magnet.
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8) What happens to the domains in a ferromagnetic material when it is magnetized? _________________
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9) Describe 2 completely different ways of making a magnet lose its magnetism. ____________________
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10) True False When a magnet is broken in two, one piece will be a south magnetic pole and the other
will be a north magnetic pole.
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Sect 2 (Pg. 622-627)
11) The two ferromagnetic metals that make up the Earth’s core are _____________ and ____________ .
In spite of the great heat, they still make the Earth magnetic because they ______________________
______________________________________________________.
(short phrase)
12) MAGNETIC _________________ is the angle formed by imaginary lines drawn through the
__________________ pole and the ____________________ pole of the Earth.
13) The Earth’s magnetic field in space is shaped by ionized particles sent out from the ______________
in what is known as the ______________WIND.
14) Colored lights seen glowing in the sky at the Earth’s poles are called the Northern and Southern Lights
or the A_________s. They occur when charged particles strike and excite atoms in the ____________.
15) Describe how and why some rocks on the ocean floor become magnetized. _____________________
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16) (D) Where on the ocean floor do magnetized rocks form ‘mirror image’ patterns? Why do the rocks
form these patterns? _________________________________________________________________
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Sect 3 (Pg. 628-629 ONLY)
17) TRUE FALSE Any wire with an electrical current will also have a magnetic field.
18) TRUE FALSE The electromagnetic field of a wire will point in the same direction as the flow of
current in the wire.
Sect 4 (Pg. 636-638)
19) Bending a current –carrying wire into a _______________ shape combines and concentrates the
power of the many tiny magnetic fields which surround the wire. Bending the wire this way also
redirects the magnetic field so that the ends of the _____________ act like poles of a permanent
magnet. This ‘device’ is called a __________________ .
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20) What is an electromagnet able to do which a permanent bar magnet is not able to do?
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21) In an alarm bell (pg. 637),
a) What causes the clapper to strike the bell when the circuit is completed?
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b) What breaks the circuit, stops the current?
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c) After the circuit is broken, what happens to the clapper ____________________________________
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22) In a tape recorder, the vibrations of sound waves being recorded cause changes in the strength an
______________ ___________ which then causes the power of an ______________________ in the
(2 words)
recording ‘head’ to also change. The ______________ powder that coats the plastic recording
tape becomes _________________ed more or less as it passes by the recording head.
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Reviewing Content (Pg. 640-641)
MULTIPLE CHOICE
1) _____
2) _____ 3) _____ 4) _____ 5) _____
TRUE OR FALSE
6) __________ 7) __________ 8) __________
CHECKING CONCEPTS 11) (T) _____________________________________________________
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Unbroken
Diagram for 11
Broken
THINKING CRITICALLY 19) (D) ________________________________________________________
21) (D) ____________________________________________________________
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APPLYING SKILLS 26) (D)
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HONOR PLEDGE:
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