Question 1

Faraday's law is the law that describes

Accepted Answer

A) electromagnetic induction. 
B) the connection between current, voltage, and resistance. 
C) the attraction and repulsion of magnetic poles. 
D) the force between magnetic poles. 
E) all of the above 
A) electromagnetic induction. 
B) the connection between current, voltage, and resistance. 
C) the attraction and repulsion of magnetic poles. 
D) the force between magnetic poles. 
E) all of the above A

Question 2

A superconducting electromagnet makes use of

Accepted Answer

A) low-resistance coils of wire. 
B) super-high temperatures. 
C) high-speed electrons. 
D) close packing of high-density magnetic domains. 
A) low-resistance coils of wire. 
B) super-high temperatures. 
C) high-speed electrons. 
D) close packing of high-density magnetic domains. A

Question 3

Voltage produced by a generator alternates because

Accepted Answer

A) it produces pulses of current. 
B) the magnetic field that produces it alternates. 
C) alternations in the mechanical energy input. 
D) in effect it is an ac motor in reverse. 
E) the current it produces alternates. 
A) it produces pulses of current. 
B) the magnetic field that produces it alternates. 
C) alternations in the mechanical energy input. 
D) in effect it is an ac motor in reverse. 
E) the current it produces alternates. B

Question 4

Surrounding our planet Earth are

Accepted Answer

A) cosmic rays. 
B) magnetic fields. 
C) both 
A) cosmic rays. 
B) magnetic fields. 
C) both

Question 5

A transformer actually transforms

Accepted Answer

A) energy from one value of voltage to another. 
B) magnetic field lines. 
C) generators into motors. 
D) non-safe forms of energy to safe forms of energy. 
E) all of the above 
A) energy from one value of voltage to another. 
B) magnetic field lines. 
C) generators into motors. 
D) non-safe forms of energy to safe forms of energy. 
E) all 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

The sloshing of electrons inside a generator need

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 8

Power is the rate at which

Accepted Answer

A) energy is transferred. 
B) voltage can be changed. 
C) current can be induced. 
A) energy is transferred. 
B) voltage can be changed. 
C) current can be induced.

Question 9

A 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 10

Metal detectors that locate metal beneath sand on a beach are activated by

Accepted Answer

A) electric fields. 
B) magnetic fields. 
C) electromagnetic induction. 
D) alternating current. 
A) electric fields. 
B) magnetic fields. 
C) electromagnetic induction. 
D) alternating current.

Question 11

Surrounding every moving electron is

Accepted Answer

A) a magnetic field. 
B) an electric field. 
C) both 
D) neither 
A) a magnetic field. 
B) an electric field. 
C) both 
D) neither

Question 12

Magnetic domains normally occur in

Accepted Answer

A) iron. 
B) copper. 
C) silver. 
D) all of the above 
E) none of the above 
A) iron. 
B) copper. 
C) silver. 
D) all of the above 
E) none of the above

Question 13

A current of 4 A exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?

Accepted Answer

A) 27.5 W 
B) 110 W 
C) 440 W 
D) 880 W 
E) not enough information 
A) 27.5 W 
B) 110 W 
C) 440 W 
D) 880 W 
E) not enough information

Question 14

Electromagnetic induction was discovered by

Accepted Answer

A) Joseph Henry. 
B) Michael Faraday. 
C) both 
D) neither 
A) Joseph Henry. 
B) Michael Faraday. 
C) both 
D) neither

Question 15

When a magnet is thrust into a coil of wire, a greater voltage is induced

Accepted Answer

A) with a greater number of loops in the coil. 
B) with faster thrusting motion. 
C) both 
D) neither 
A) with a greater number of loops in the coil. 
B) with faster thrusting motion. 
C) both 
D) neither

Question 16

When a change of magnetic field occurs in a closed loop of wire,

Accepted Answer

A) a voltage is induced in the wire. 
B) current is made to flow in the loop of wire. 
C) electromagnetic induction occurs. 
D) all of the above 
E) none of the above 
A) a voltage is induced in the wire. 
B) current is made to flow in the loop of wire. 
C) electromagnetic induction occurs. 
D) all of the above 
E) none of the above

Question 17

A bar magnet that holds a chain of nails illustrates

Accepted Answer

A) magnetic field displacement. 
B) magnetic induction. 
C) electromagnetic induction. 
A) magnetic field displacement. 
B) magnetic induction. 
C) electromagnetic induction.

Question 18

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 19

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 20

The rapid alteration of an electric field induces

Accepted Answer

A) a stronger electric field. 
B) a magnetic field. 
C) both 
D) neither 
A) a stronger electric field. 
B) a magnetic field. 
C) both 
D) neither

Exam 9: Magnetism and Electromagnetic Induction

Faraday's law is the law that describes

A superconducting electromagnet makes use of

Voltage produced by a generator alternates because

Surrounding our planet Earth are

A transformer actually transforms

Which of these statements is true?

The sloshing of electrons inside a generator need

Power is the rate at which

A step-down transformer decreases

Metal detectors that locate metal beneath sand on a beach are activated by

Surrounding every moving electron is

Magnetic domains normally occur in

A current of 4 A exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?

Electromagnetic induction was discovered by

When a magnet is thrust into a coil of wire, a greater voltage is induced

When a change of magnetic field occurs in a closed loop of wire,

A bar magnet that holds a chain of nails illustrates

A galvanometer calibrated to read current is

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

The rapid alteration of an electric field induces

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 Timereading 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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