Question 1

Several paper clips dangle from the north pole of a magnet.The induced pole in the bottom of the lowermost paper clip is a

Accepted Answer

A) north pole. 
B) south pole. 
C) either of these 
D) neither of these 
A) north pole. 
B) south pole. 
C) either of these 
D) neither of these

Question 2

What correction do you suggest to a friend who states that a step-up transformer boosts energy,while a step-down transformer reduces energy in a circuit?

Accepted Answer

Mainly,remind your friend of the conserv

Question 3

Compared with the current in the primary coil of a transformer,the current in the secondary coil

Accepted Answer

A) is greater. 
B) is less. 
C) can be greater or less. 
D) none of the above 
A) is greater. 
B) is less. 
C) can be greater or less. 
D) none of the above

Question 4

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

Question 5

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 6

The rule for the interaction of magnetic poles is similar to the rule for electric

Accepted Answer

A) circuits. 
B) polarization. 
C) charges. 
A) circuits. 
B) polarization. 
C) charges.

Question 7

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 8

When a current-carrying wire is bent into a loop,its magnetic field inside the loop

Accepted Answer

A) weakens. 
B) becomes concentrated. 
C) cancels. 
D) none of the above 
A) weakens. 
B) becomes concentrated. 
C) cancels. 
D) none of the above

Question 9

The frequency of a generated electromagnetic wave matches the

Accepted Answer

A) field strength of the fields. 
B) energy of the fields. 
C) frequency of vibrating charges that produced it. 
D) frequency of domains in the magnetic part of the wave. 
A) field strength of the fields. 
B) energy of the fields. 
C) frequency of vibrating charges that produced it. 
D) frequency of domains in the magnetic part of the wave.

Question 10

The voltage across the input terminals of a transformer is 110 V.The primary coil has 50 loops and the secondary coil has 100 loops.The output is

Accepted Answer

A) 25 V. 
B) 55 V. 
C) 110 V. 
D) 220 V. 
E) none of the above 
A) 25 V. 
B) 55 V. 
C) 110 V. 
D) 220 V. 
E) none of the above

Question 11

The amount of current produced by electromagnetic induction depends on the

Accepted Answer

A) amount of induced voltage. 
B) resistance of the circuit to which it is connected. 
C) both of these 
D) none of the above 
A) amount of induced voltage. 
B) resistance of the circuit to which it is connected. 
C) both of these 
D) none of the above

Question 12

In which of these locations is cosmic ray intensity greatest?

Accepted Answer

A) Mexico City 
B) Toronto 
C) Singapore 
D) all about the same 
A) Mexico City 
B) Toronto 
C) Singapore 
D) all about the same

Question 13

The magnetic field inside a current-carrying coil increases when

Accepted Answer

A) current is increased. 
B) the number of loops of wire in the coil increases. 
C) an iron core is inserted. 
D) all of the above 
E) none of the above 
A) current is increased. 
B) the number of loops of wire in the coil increases. 
C) an iron core is inserted. 
D) all of the above 
E) none of the above

Question 14

When a bar magnet is thrust at the same speed into a coil having twice the number of loops,the induced voltage is

Accepted Answer

A) half. 
B) the same,no different. 
C) twice as much. 
D) four times as much. 
E) none of the above 
A) half. 
B) the same,no different. 
C) twice as much. 
D) four times as much. 
E) none of the above

Question 15

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 16

The current produced by a common generator is

Accepted Answer

A) dc. 
B) ac. 
C) neither of these 
A) dc. 
B) ac. 
C) neither of these

Question 17

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 18

A topic that most underlies electrical studies and all of physics is

Accepted Answer

A) Newton's laws of motion. 
B) the conservation of momentum. 
C) the conservation of energy. 
A) Newton's laws of motion. 
B) the conservation of momentum. 
C) the conservation of energy.

Question 19

The intensity of cosmic rays bombarding the Earth's surface is greatest at

Accepted Answer

A) the poles. 
B) mid-latitudes. 
C) the equator. 
D) no particular locations. 
A) the poles. 
B) mid-latitudes. 
C) the equator. 
D) no particular locations.

Question 20

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

Exam 9: Magnetism and Electromagnetic Induction

Several paper clips dangle from the north pole of a magnet.The induced pole in the bottom of the lowermost paper clip is a

What correction do you suggest to a friend who states that a step-up transformer boosts energy,while a step-down transformer reduces energy in a circuit?

Compared with the current in the primary coil of a transformer,the current in the secondary coil

The metal detectors that travelers walk through at airports operate via

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

The rule for the interaction of magnetic poles is similar to the rule for electric

Magnetic domains normally occur in

When a current-carrying wire is bent into a loop,its magnetic field inside the loop

The frequency of a generated electromagnetic wave matches the

The voltage across the input terminals of a transformer is 110 V.The primary coil has 50 loops and the secondary coil has 100 loops.The output is

The amount of current produced by electromagnetic induction depends on the

In which of these locations is cosmic ray intensity greatest?

The magnetic field inside a current-carrying coil increases when

When a bar magnet is thrust at the same speed into a coil having twice the number of loops,the induced voltage is

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

The current produced by a common generator is

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

A topic that most underlies electrical studies and all of physics is

The intensity of cosmic rays bombarding the Earth's surface is greatest at

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

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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