Chapter 10

Question 1

What is an object capable of attracting materials such as iron or steel by a magnetic force?

Answer 1

magnet

Question 2

What is the property of attracting objects by the magnetic force?

Answer 2

magnetism

Question 3

What is the regions of concentrated magnetism in a magnet?

Answer 3

pole

Question 4

What is the pole of a magnet that points north?

Answer 4

north pole

Question 5

What is the pole of a magnet that points south?

Answer 5

south pole

Question 6

What is the law stating that unlike poles attract and like poles repel?

Answer 6

law of magnetic poles

Question 7

What is the region surrounding a magnet in which other objects are affected by magnetism?

Answer 7

magnetic field

Question 8

What are the imaginary lines that indicate the direction and the strength of a magnetic field?

Answer 8

lines of flux

Question 9

What is the law stating that the force between two magnetic poles is directly related to the product of the pole strength and inversely related to the square of the distance between the poles?

Answer 9

law of magnetic force

Question 10

What is the extent to which a material can absorb or channel lines of magnetic force?

Answer 10

permeability

Question 11

How are magnetic fields produced?

Answer 11

by the motion of electrons and other charged particles

Question 12

What is the most important cause of magnetism in magnetic materials?

Answer 12

electron spin

Question 13

What is a group of aligned atoms having a single magnetic field?

Answer 13

domain

Question 14

What describes substances that have no unpaired electrons and are always slightly repelled by either pole of a magnet?

Answer 14

diamagnetic

Question 14

What is the theory that states that the magnetic field of a magnet is the sum of thousands of magnetic domians?

Answer 14

domain theory

Question 15

What describes substances that have only one unpaired electron and are weakly attracted to magnets?

Answer 15

paramagnetic

Question 16

What describes substances that have several unpaired electrons and are strongly attracted to magnets?

Answer 16

ferromagnetic

Question 17

What describes substances that can be quickly magnetized even in a weak magnetic field?

Answer 17

magnetically soft

Question 18

What describes materials whose domains strongly resist changes in the direction of their magnetic fields?

Answer 18

magnetically hard

Question 19

What is a magnets made from magnetically hard material?

Answer 19

permanent magent

Question 20

What is a magnet made from magnetically soft material?

Answer 20

temporary magnet

Question 21

What is magnetizing by stroking an object with a magnet?

Answer 21

magnetizing by contact

Question 22

What is temporary magnetization caused by placing an object within a magnetic field?

Answer 22

magnetizing by induction

Question 23

What is magnetizing caused around a wire by electricity flowing through a wire?

Answer 23

magnetizing by electricity

Question 24

What is a device that produces a strong magnetic field when electricity passes through it?

Answer 24

electromagnet

Question 25

What is the rule stating that if the thumb of the left hand is pointed along a wire in the direction of electron current, the fingers encircle the conductor in the direction of the generated magnetic field?

Answer 25

left-hand rule

Question 26

What is a magnetically soft material placed within the coils of an electromagnet in order to strengthen its field?

Answer 26

core

Question 27

What is the temperature at which a ferromagnetic material's domains disappear?

Answer 27

Curie point

Question 28

What is the resistance of a magnet to being demagnetized by a magnetic field?

Answer 28

coercivity

Question 29

What is the force on an electric charge moving in a magnetic field that causes the charge to deviate from its original path?

Answer 29

deflecting force

Question 30

What is a navigational device consisting of a magnet free to swing horizontally so that it always points north?

Answer 30

magnetic compass

Question 31

Who was a British pioneer of electrostatics and discovered that a compass points north because it is guided by Earth's magnetic field?

Answer 31

William Gilbert

Question 32

What is the book in which William Gilbert published his findings on magnetism?

Answer 32

De Magnete

Question 33

What is the geographically north magnetic pole of the earth; a "south-seeking" pole?

Answer 33

north magnetic pole

Question 34

What is the geographically south magnetic pole of the earth; a "north-seeking" pole?

Answer 34

south magnetic pole

Question 35

Do the magnetic poles of the earth coincide exactly with the geographic poles?

Answer 35

no

Question 36

If the earth's magnetic poles are no called north and south because of their magnetic properties, what are they named for?

Answer 36

their geographic locations

Question 37

What is the direction to the earth's geographic north pole considered to be?

Answer 37

true north

Question 38

What is the deviation of a compass needle from true north?

Answer 38

angle of declination

Question 39

What is a line connecting points of equal declination?

Answer 39

isogonic line

Question 40

What is a line connecting all points where a compass needle points true north?

Answer 40

agonic line

Question 41

What is the phenomenon in which a compass constructed with a magnet that swings vertically instead of horizontally points in the angle at which lines of flux enters the earth?

Answer 41

inclination

Question 42

What is a line connecting points of equal inclination?

Answer 42

isoclinic lines

Question 43

What is an isoclinic line where the angle of inclination is 0°?

Answer 43

magnetic equator

Question 44

What is the extent of a planet's magnetic field in space?

Answer 44

magnetosphere

Question 45

What is a stream of plasma that emanates from the sun?

Answer 45

solar wind

Question 46

What is the portion of a magnetosphere that stretched out away from the sun?

Answer 46

magnetotail

Question 47

What is the outer boundary of the magnetoshpere?

Answer 47

magnetopause

Question 48

What are two vast, doughnut-shaped belts of high-speed charged particles surrounding Earth?

Answer 48

Van Allen radiation belts

Question 49

What is the display of shimmering light produced by high-speed particles that spiral into the upper atmosphere and crash into molecules of air?

Answer 49

auroras

Question 50

What is another name for the northern lights?

Answer 50

aurora borealis

Question 51

What is another name for the southern lights?

Answer 51

aurora australis

Question 52

Is Earth the only natural magnet in the solar system?

Answer 52

no