Question 1

A galvanometer calibrated to read potential difference is

Accepted Answer

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

Question 2

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 aboveE) None of the above
F) All of the above

Question 3

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 aboveF) D) and E)
G) A) and E)

Question 4

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 aboveF) B) and E)
G) B) and D)

Question 5

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 aboveF) B) and E)
G) A) and E)

Question 6

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 aboveF) C) and D)
G) C) and E)

Question 7

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 aboveE) None of the above
F) B) and C)

Question 8

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 aboveE) A) and B)
F) A) and C)

Question 9

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 aboveE) None of the above
F) B) and D)

Question 10

Moving electric charges will interact with

Accepted Answer

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

Question 11

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 aboveF) All of the above
G) D) and E)

Question 12

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 aboveE) All of the above
F) None of the above

Question 13

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.E) A) and B)
F) C) and D)

Question 14

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 15

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 aboveE) B) and D)
F) C) and D)

Question 16

An efficient step-down transformer decreases

Accepted Answer

A)  current.
B)  voltage.
C)  power.
D)  energy.
E)  all of the aboveF) All of the above
G) B) and C)

Question 17

A galvanometer calibrated to read current is

Accepted Answer

A)  an ammeter.
B)  a voltmeter.
C)  an ohm meter.
D)  none of the aboveE) A) and B)
F) A) and C)

Question 18

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 aboveE) A) and B)
F) All of the above

Question 19

A transformer requires

Accepted Answer

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

Question 20

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 acE) A) and D)
F) C) and D)

Exam 9: Magnetism and Electromagnetic Induction

The sloshing of electrons inside a generator needs

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A transformer requires

Correct AnswerverifiedShow Answer

A galvanometer calibrated to read potential difference is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Moving electric charges will interact with

Correct AnswerverifiedShow Answer

An efficient step-down transformer decreases

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An iron nail is attracted

Correct AnswerverifiedShow Answer

A galvanometer calibrated to read current is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An electric generator

Correct AnswerverifiedShow Answer

Magnetic field lines about a current-carrying wire

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Which of these statements is true?

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

Correct AnswerverifiedAll magnetic fields have their origin in...View AnswerShow Answer

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All magnetic fields have their origin in...
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