Question 1

When a magnet is thrust into a coil of wire, the coil tends to

Accepted Answer

A) attract the magnet as it enters. 
B) repel the magnet as it enters. 
C) both 
D) neither 
A) attract the magnet as it enters. 
B) repel the magnet as it enters. 
C) both 
D) neither

Question 2

A magnetic force acts most strongly on a current carrying wire when it

Accepted Answer

A) carries a very large current. 
B) is perpendicular to the magnetic field. 
C) either or both 
D) none of the above 
A) carries a very large current. 
B) is perpendicular to the magnetic field. 
C) either or both 
D) none of the above

Question 3

A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has

Accepted Answer

A) 1/5 as many turns. 
B) 5 times as many turns. 
C) the same number of turns. 
D) none of the above 
A) 1/5 as many turns. 
B) 5 times as many turns. 
C) the same number of turns. 
D) none of the above

Question 4

Voltage can be induced in a wire by

Accepted Answer

A) moving the wire near a magnet. 
B) moving a magnet near the wire. 
C) changing the current in a nearby wire. 
D) all of the above 
E) none of the above 
A) moving the wire near a magnet. 
B) moving a magnet near the wire. 
C) changing the current in a nearby wire. 
D) all of the above 
E) none of the above

Question 5

The metal detectors that travelers walk through at airports operate via

Accepted Answer

A) Ohm's law. 
B) Faraday's law. 
C) Coulomb's law. 
D) Newton's laws. 
E) civil laws. 
A) Ohm's law. 
B) Faraday's law. 
C) Coulomb's law. 
D) Newton's laws. 
E) civil laws.

Question 6

What is the connection, if any, between electromagnetic induction and sunshine?

Accepted Answer

Sunshine is light, which is part of the

Question 7

Refrigerator magnets

Accepted Answer

A) have short range. 
B) are without magnetic poles. 
C) both 
A) have short range. 
B) are without magnetic poles. 
C) both

Question 8

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

Accepted Answer

A) attract. 
B) repel also. 
C) may attract or repel. 
A) attract. 
B) repel also. 
C) may attract or repel.

Question 9

The frequency with which a magnet plunges into and out of a magnetic field equals the frequency of the induced

Accepted Answer

A) voltage. 
B) current. 
C) both 
D) neither 
A) voltage. 
B) current. 
C) both 
D) neither

Question 10

A device that transforms mechanical energy to electrical energy is a

Accepted Answer

A) generator. 
B) motor. 
C) transformer. 
D) magnet. 
E) none of the above 
A) generator. 
B) motor. 
C) transformer. 
D) magnet. 
E) none of the above

Question 11

A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is

Accepted Answer

A) 2 A. 
B) 5 A. 
C) 10 A. 
D) 25 A. 
E) none of the above 
A) 2 A. 
B) 5 A. 
C) 10 A. 
D) 25 A. 
E) none of the above

Question 12

What field generation cannot create is

Accepted Answer

A) light. 
B) electromagnetic waves. 
C) energy. 
A) light. 
B) electromagnetic waves. 
C) energy.

Question 13

An electronic game requires 6 V for operation. A transformer allows it to be powered from 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) none of the above 
A) 4 turns. 
B) 25 turns. 
C) 50 turns. 
D) none of the above

Question 14

Electromagnetic induction is employed in

Accepted Answer

A) credit cards. 
B) computers. 
C) iPads. 
D) all of the above 
E) none of the above 
A) credit cards. 
B) computers. 
C) iPads. 
D) all of the above 
E) none of the above

Question 15

State Faraday's law of induction and explain what it means.

Accepted Answer

Faraday's law states that voltage induce

Question 16

Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is

Accepted Answer

A) of low wattage. 
B) of high wattage. 
C) burned out. 
D) none of the above 
A) of low wattage. 
B) of high wattage. 
C) burned out. 
D) none of the above

Question 17

Maxwell's counterpart to Faraday's law simply states that

Accepted Answer

A) each change in field induces the other. 
B) electric and magnetic fields are one and the same. 
C) induced fields are parallel to each other. 
A) each change in field induces the other. 
B) electric and magnetic fields are one and the same. 
C) induced fields are parallel to each other.

Question 18

An iron nail is more strongly attracted to the

Accepted Answer

A) north pole of a magnet. 
B) south pole of a magnet. 
C) north or south pole-no difference. 
A) north pole of a magnet. 
B) south pole of a magnet. 
C) north or south pole-no difference.

Question 19

Every spinning electron is

Accepted Answer

A) electrically charged. 
B) is a tiny magnet. 
C) both 
D) none of the above 
A) electrically charged. 
B) is a tiny magnet. 
C) both 
D) none of the above

Question 20

Maximum magnetic force occurs when electrons move

Accepted Answer

A) in the same direction as the magnetic field. 
B) opposite to the magnetic field direction. 
C) perpendicular to the magnetic field direction. 
D) at an angle other than 90° to the magnetic field direction. 
E) none of the above 
A) in the same direction as the magnetic field. 
B) opposite to the magnetic field direction. 
C) perpendicular to the magnetic field direction. 
D) at an angle other than 90° to the magnetic field direction. 
E) none of the above

Exam 9: Magnetism and Electromagnetic Induction

When a magnet is thrust into a coil of wire, the coil tends to

A magnetic force acts most strongly on a current carrying wire when it

A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has

Voltage can be induced in a wire by

The metal detectors that travelers walk through at airports operate via

What is the connection, if any, between electromagnetic induction and sunshine?

Refrigerator magnets

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

The frequency with which a magnet plunges into and out of a magnetic field equals the frequency of the induced

A device that transforms mechanical energy to electrical energy is a

A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is

What field generation cannot create is

An electronic game requires 6 V for operation. A transformer allows it to be powered from a 120-V outlet. If the primary has 500 turns, the secondary has

Electromagnetic induction is employed in

State Faraday's law of induction and explain what it means.

Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is

Maxwell's counterpart to Faraday's law simply states that

An iron nail is more strongly attracted to the

Every spinning electron is

Maximum magnetic force occurs when electrons move

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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