Question 1

The principal difference between a step-up and step-down transformer is

Accepted Answer

A) step-up transformers can handle more current. 
B) different geometries. 
C) different ratios of turns for each set of loops or coils. 
D) none of the above 
A) step-up transformers can handle more current. 
B) different geometries. 
C) different ratios of turns for each set of loops or coils. 
D) none of the above

Question 2

A transformer requires

Accepted Answer

A) alternating voltage. 
B) direct current. 
C) both of these 
D) none of the above 
A) alternating voltage. 
B) direct current. 
C) both of these 
D) none of the above

Question 3

As the number of loops in a current-carrying wire coil is increased,the magnetic field becomes

Accepted Answer

A) more spread out. 
B) more stable. 
C) stronger. 
D) weaker. 
E) none of the above 
A) more spread out. 
B) more stable. 
C) stronger. 
D) weaker. 
E) none of the above

Question 4

Into which stable force field can a proton be placed at rest without being accelerated?

Accepted Answer

A) magnetic field 
B) electric field 
C) both of these 
D) none of the above 
A) magnetic field 
B) electric field 
C) both of these 
D) none of the above

Question 5

Electromagnetic induction occurs in a coil when there is a change in

Accepted Answer

A) electric field intensity. 
B) magnetic field intensity. 
C) voltage. 
D) the coil's polarity. 
E) none of the above 
A) electric field intensity. 
B) magnetic field intensity. 
C) voltage. 
D) the coil's polarity. 
E) none of the above

Question 6

Which of these statements is true?

Accepted Answer

A) a battery produces dc and a generator produces ac 
B) a battery produces ac and a generator produces dc 
C) a battery and a generator produce dc 
D) a battery and a generator produce ac 
A) a battery produces dc and a generator produces ac 
B) a battery produces ac and a generator produces dc 
C) a battery and a generator produce dc 
D) a battery and a generator produce ac

Question 7

An efficient step-down transformer decreases

Accepted Answer

A) current. 
B) voltage. 
C) power. 
D) energy. 
E) all of the above 
A) current. 
B) voltage. 
C) power. 
D) energy. 
E) all of the above

Question 8

When current reverses direction in a wire,the surrounding magnetic field

Accepted Answer

A) also reverses direction. 
B) becomes momentarily stronger. 
C) contracts. 
D) expands. 
A) also reverses direction. 
B) becomes momentarily stronger. 
C) contracts. 
D) expands.

Question 9

The magnetic field strength inside a current-carrying coil will be greater if the coil encloses

Accepted Answer

A) a vacuum. 
B) a wooden rod. 
C) a glass rod. 
D) an iron rod. 
E) none of the above 
A) a vacuum. 
B) a wooden rod. 
C) a glass rod. 
D) an iron rod. 
E) none of the above

Question 10

Magnetic field lines about a current-carrying wire

Accepted Answer

A) extend radially from the wire. 
B) circle the wire in closed loops. 
C) both of these 
D) none of the above 
A) extend radially from the wire. 
B) circle the wire in closed loops. 
C) both of these 
D) none of the above

Question 11

An electronic game requires 6 V for operation.With a transformer it can be powered by a 120-V outlet.If the primary has 500 turns,the secondary has

Accepted Answer

A) 4 turns. 
B) 25 turns. 
C) 50 turns. 
D) more than 50 turns. 
E) none of the above 
A) 4 turns. 
B) 25 turns. 
C) 50 turns. 
D) more than 50 turns. 
E) none of the above

Question 12

What is the cause of a magnetic field about a permanent magnet and about a current-carrying wire?

Accepted Answer

All magnetic fields have their origin in

Question 13

Which force field can both accelerate an electron and change its speed?

Accepted Answer

A) electric field. 
B) magnetic field. 
C) both of these 
D) none of the above 
A) electric field. 
B) magnetic field. 
C) both of these 
D) none of the above

Question 14

An iron nail is attracted

Accepted Answer

A) more strongly to the north pole of a magnet. 
B) more strongly to the south pole of a magnet. 
C) equally to either pole of a magnet. 
D) none of the above 
A) more strongly to the north pole of a magnet. 
B) more strongly to the south pole of a magnet. 
C) equally to either pole of a magnet. 
D) none of the above

Question 15

Moving electric charges will interact with

Accepted Answer

A) an electric field. 
B) a magnetic field. 
C) both of these 
D) none of the above 
A) an electric field. 
B) a magnetic field. 
C) both of these 
D) none of the above

Question 16

A galvanometer calibrated to read potential difference is

Accepted Answer

A) an ammeter. 
B) a voltmeter. 
C) an ohm meter. 
D) none of the above 
A) an ammeter. 
B) a voltmeter. 
C) an ohm meter. 
D) none of the above

Question 17

The sloshing of electrons inside a generator needs

Accepted Answer

A) an outside source of energy. 
B) a copper lattice. 
C) positive ions. 
D) none of the above 
A) an outside source of energy. 
B) a copper lattice. 
C) positive ions. 
D) none of the above

Question 18

An electric generator

Accepted Answer

A) can create enough energy to light cities. 
B) can convert mechanical energy to electric energy. 
C) needs no energy source. 
D) all the above 
E) none of the above 
A) can create enough energy to light cities. 
B) can convert mechanical energy to electric energy. 
C) needs no energy source. 
D) all the above 
E) none of the above

Question 19

A galvanometer calibrated to read current is

Accepted Answer

A) an ammeter. 
B) a voltmeter. 
C) an ohm meter. 
D) none of the above 
A) an ammeter. 
B) a voltmeter. 
C) an ohm meter. 
D) none of the above

Question 20

The frequency with which a magnet plunges into and out of a wire coil equals the frequency of the induced

Accepted Answer

A) voltage. 
B) current. 
C) both of these 
D) none of the above 
A) voltage. 
B) current. 
C) both of these 
D) none of the above

Exam 9: Magnetism and Electromagnetic Induction

The principal difference between a step-up and step-down transformer is

A transformer requires

As the number of loops in a current-carrying wire coil is increased,the magnetic field becomes

Into which stable force field can a proton be placed at rest without being accelerated?

Electromagnetic induction occurs in a coil when there is a change in

Which of these statements is true?

An efficient step-down transformer decreases

When current reverses direction in a wire,the surrounding magnetic field

The magnetic field strength inside a current-carrying coil will be greater if the coil encloses

Magnetic field lines about a current-carrying wire

An electronic game requires 6 V for operation.With a transformer it can be powered by a 120-V outlet.If the primary has 500 turns,the secondary has

What is the cause of a magnetic field about a permanent magnet and about a current-carrying wire?

Which force field can both accelerate an electron and change its speed?

An iron nail is attracted

Moving electric charges will interact with

A galvanometer calibrated to read potential difference is

The sloshing of electrons inside a generator needs

An electric generator

A galvanometer calibrated to read current is

The frequency with which a magnet plunges into and out of a wire coil equals the frequency of the induced

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

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