Test 8

Question 1

substances with no unpaired electrons

Answer 1

Diamagnetic substances

Question 2

material weakly attracted to a magnet

Answer 2

Paramagnetic

Question 3

strongly attracted to magnets

Answer 3

Ferromagnetic

Question 4

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

Answer 4

Magnetically soft

Question 5

quickly loses most of its magnetism when the magnetic field is removed

Answer 5

Temporary magnet

Question 6

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

Answer 6

Magnetically hard

Question 7

magnets made from magnetically hard materials

Answer 7

Permanent magnets

Question 8

stroking an object with a magnet

Answer 8

Magnetizing by contact

Question 8

around a wire by electricity flowing through a wire

Answer 8

Magnetizing by electricity

Question 9

placing an object within a magnetic field

Answer 9

Magnetizing by induction

Question 10

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

Answer 10

Electromagnet

Question 11

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

Answer 11

Core

Question 12

temperature at which a ferromagnetic material’s domains disappear

Answer 12

Curie point

Question 13

resistance of a magnet to being demagnetized by a magnetic field

Answer 13

Coercivity

Question 14

force existing in a magnetic field that causes a moving electric charge to deviate from its original path

Answer 14

Deflecting force

Question 15

the most important cause of magnetism in magnetic materials

Answer 15

Electron Spin

Question 16

strip of metal that connects the two poles

Answer 16

Keeper

Question 17

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

Answer 17

Magnetic compass

Question 18

discovered that a compass points north because it is guided by Earth’s magnetic field

Answer 18

William Gilbert

Question 18

book William Gilbert published with his findings on magnetism

Answer 18

De Magnete

Question 19

the geographically north magnetic pole of the earth, a “south seeking” pole

Answer 19

North magnetic pole

Question 20

the geographically south magnetic pole of the earth, a “north seeking” pole

Answer 20

South magnetic pole

Question 21

deviation of a compass needle from true north

Answer 21

Angle of declination

Question 22

connects points of equal declination

Answer 22

Isogonic lines

Question 23

line connecting all points where a compass needle points true north

Answer 23

Agonic line

Question 24

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

Answer 24

Inclination

Question 25

line connecting points with equal inclination

Answer 25

Isoclinic lines

Question 26

isoclinic line where the angle of inclination is 0°

Answer 26

Magnetic equator

Question 27

device that produces static electricity

Answer 27

Electrostatic generator

Question 28

most common electrostatic generator in use today is the high-voltage

Answer 28

Van de Graaff generator

Question 29

large discharge of static electricity between the ground and a cloud during a thunderstorm

Answer 29

Lightning

Question 29

device used to store a static electric charge

Answer 29

Capacitor

Question 29

device for protecting buildings and other structures from lightning strikes

Answer 29

Lightning rod

Question 29

early device used to store an electric charge

Answer 29

Leyden Jar

Question 29

eerie blue glow that appears around pointed objects during storms

Answer 29

St. Elmo’s Fire

Question 30

electrostatic method of reproducing images on paper

Answer 30

Xerography

Question 31

electric lamp that produces light by heating a thin wire called a filament to a high temperature

Answer 31

Incandescent Lamp

Question 31

produces light by passing an electric current through a long tube filled with a low-pressure mixture of mercury vapor and argon

Answer 31

Fluorescent lamp

Question 32

fluorescent lamp that uses coiled tubes to be about the size of a regular incandescent bulb and is designed to fit in sockets designed for incandescent bulbs

Answer 32

Compact fluorescent lamps (CFL)

Question 32

electric discharge lamp filled with neon gas instead of mercury vapor

Answer 32

Neon lamp

Question 33

semiconductor devices that emit light when a direct electric current is applied

Answer 33

Light-emitting diodes

Question 34

device that converts electricity to a back and forth motion

Answer 34

Solenoid

Question 35

device for communicating over long distances by means of electromagnets

Answer 35

Telegraph

Question 36

American inventor, scientist, and artist best known for his invention of the telegraph

Answer 36

Samuel Morse

Question 37

electrical switch operated by an electromagnet

Answer 37

Relay

Question 38

converts pulses of electricity into sound waves

Answer 38

Loudspeaker

Question 39

device for converting electricity into motion

Answer 39

Electric motor

Question 40

changing the direction of the current in the armature each half-turn causes the armature to rotate continuously

Answer 40

DC motor

Question 41

does not need a commutator because alternating currents already alternate direction

Answer 41

AC motor

Question 42

current producing electrochemical cell that can be recharged with electricity from an outsider current source

Answer 42

Storage cells

Question 42

non-rechargeable electrochemical cell in which a chemical reaction produces electricity

Answer 42

Voltaic cells

Question 43

electrode through which electrons exit an electrochemical cell, negative terminal

Answer 43

Anode

Question 44

electrode through which electrons enter an electrochemical cell, positive terminal

Answer 44

Cathode

Question 44

one or more electrochemical cells connected to terminals as a single source of current

Answer 44

Battery

Question 45

the ability of magnetism to convert mechanical motion into electric current

Answer 45

Electromagnetic induction

Question 46

device that uses electromagnetic induction to produce electricity

Answer 46

Generator

Question 47

device that increases or decreases the voltage of alternating current using electromagnetic induction

Answer 47

Transformer

Question 47

device in which a conducting fluid passes through a magnetic field at high seed to generate electricity

Answer 47

Magnetohydrodynamic generator