Abeka 9Th Grade Science Test 10

Front 1

Imparting a charge by bringing a charged object near, but not touching, a neutral object is charging by ____.

Back 1

Induction

Front 2

What is the stream of charged particles that emanates from the sun called?

Back 2

Solar wind

Front 3

The extent to which a material can channel or absorb lines of magnetic flux is the material's _____.

Back 3

Permeability

Front 4

The two points on a magnet where its magnetism is concentrated are the ____.

Back 4

Poles

Front 5

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?

Back 5

5.00 N

Front 6

And imaginary circle around the earth halfway between the magnetic poles is the _____.

Back 6

Magnetic equator

Front 7

What methods are magnetization?

Back 7

Contact, electricity, and induction.

Front 8

A material that has only one unpaired electron per atom and is weakly attracted to magnets is _____.

Back 8

Paramagnetic

Front 9

An electric field in which the strength is evenly distributed throughout, as between plates of opposite charge, is a _____.

Back 9

Uniform field

Front 10

The most important cause of magnetism in magnetic materials is ____.

Back 10

Electron spin

Front 11

An excess of electrons causes a _____ charge.

Back 11

Negative

Front 12

An object that has no overall electrical charge is _____.

Back 12

Neutral

Front 13

The amount by which a compass needle deviates from true north is the angle of _____.

Back 13

Declination

Front 14

What phenomenon causes a vertical compass to point downward in the Northern Hemisphere?

Back 14

Inclination

Front 15

If the strength of a magnet doubles, what happens to the force between it and another magnet?

Back 15

Doubled

Front 16

If the distance between two magnets is halved, what happens to the strength of the magnetic force between them?

Back 16

Quadrupled

Front 17

In a lightning bolt, the downward flow of charge from the cloud attracts an upward flow charge from the ground called the _____.

Back 17

Positive streamer

Front 18

The boundary of the magnetosphere is the ____.

Back 18

Magnetopause

Front 19

Which law states that the total charge is the same before and after an interaction?

Back 19

Law of conservation of charge

Front 20

Which law states that like poles repel and unlike poles attract?

Back 20

Law of magnetic poles

Front 21

Quadrupling the current increases the strength of an electromagnet by a factor of ____.

Back 21

16

Front 22

If the number of loops in a electromagnet's coil is doubled, the strength of the electromagnet is ____.

Back 22

Doubled

Front 23

Electric charges are considered _____ electricity.

Back 23

Static

Front 24

Lines connecting points of equal inclination are ____ lines.

Back 24

Isoclinic

Front 25

Our understanding of how magnets work depends upon the ____ theory.

Back 25

Domain

Front 26

According to the law of electric charges, opposite charges ____ each other.

Back 26

Attract

Front 27

When a charged ball is touched to the knob of an electroscope, charge is transferred from the ball to the electroscope through _____.

Back 27

Conduction

Front 28

The two vast, doughnut-shaped belts of high-speed particles trapped in Earth's magnetic field are the ____ radiation belts.

Back 28

Van Allen

Front 29

The flow of charge from one place to another is ____.

Back 29

Current

Front 30

The north magnetic pole of the earth is a "_____-seeking" pole.

Back 30

South

Front 31

The region surrounding a charged object in which other objects are attracted or repelled by electric force is an electric _____.

Back 31

Field

Front 32

A group of aligned atoms having a single magnetic field is a ____.

Back 32

Domain

Front 33

The study of the nature, behavior, and uses of static electricity and related phenomena is ____.

Back 33

Electrostatics

Front 34

A magnet made from a magnetically hard substance is a ____ magnet.

Back 34

Permanent

Front 35

Simple device that detects small electric charges

Back 35

Electroscope

Front 36

Early device used to store an electric charge

Back 36

Leyden jar

Front 37

Most common electrostatic generator

Back 37

Van de Graaff generator

Front 38

Protects buildings and other structures from lightning strikes

Back 38

Lightning rod

Front 39

Form of magnetite that is a naturally occurring magnet

Back 39

Lodestone

Front 40

Compass that swings vertical to reveal the angle at which lines of flux enter the earth

Back 40

Dipping needle

Front 41

What is the force that changes the path of a charged particle moving through a magnetic field?

Back 41

Deflecting force

Front 42

What is the name for the temperature above it which a ferromagnetic material has no domains?

Back 42

Curie point

Front 43

What is "dry writing" that uses electric charges to reproduce images on paper?

Back 43

Xerography

Front 44

In what book did William Gilbert propose that Earth has a magnetic field?

Back 44

De Magnete or On the Magnet

Front 45

What is the display of shimmering light formed by high-speed particles spiraling into the upper atmosphere and crashing into air molecules?

Back 45

Aurora

Front 46

What is the general term for a modern device used to store electric charge?

Back 46

capacitor

Front 47

Why do the hairs on your head stand up straight and apart from each other if you are given a strong enough charge?

Back 47

Like charges repel

Front 48

What is the SI unit of charge called?

Back 48

Coulomb

Front 49

What time refers to the interactions between electrons and other charged particles?

Back 49

Electricity

Front 50

What is the process of diverting unwanted electrical charge directly into the earth?

Back 50

Grounding

Front 51

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?

Back 51

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.