Question 1

Every magnet contains at least

Accepted Answer

A) one pole. 
B) two poles. 
C) two or more poles. 
A) one pole. 
B) two poles. 
C) two or more poles.

Question 2

What happens to a current-carrying wire in a magnetic field? How does orientation of the wire make a difference?

Accepted Answer

Properly oriented, a current-carrying wi

Question 3

Break a bar magnet in half and each half is

Accepted Answer

A) a complete magnet. 
B) a stronger magnet. 
C) no longer magnetized. 
A) a complete magnet. 
B) a stronger magnet. 
C) no longer magnetized.

Question 4

A magnetic field easily penetrates

Accepted Answer

A) human flesh. 
B) plastic coatings. 
C) both 
D) none of the above 
A) human flesh. 
B) plastic coatings. 
C) both 
D) none of the above

Question 5

Changing the magnetic field intensity in a closed loop of wires induces

Accepted Answer

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

Question 6

A magnet will become weaker if it is

Accepted Answer

A) dropped on a hard surface. 
B) held in a hot flame. 
C) either 
D) neither 
A) dropped on a hard surface. 
B) held in a hot flame. 
C) either 
D) neither

Question 7

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

Accepted Answer

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

Question 8

A galvanometer measures

Accepted Answer

A) magnetic fields. 
B) electric current. 
C) electric voltage. 
D) none of the above 
A) magnetic fields. 
B) electric current. 
C) electric voltage. 
D) none of the above

Question 9

The energy source for a generator may be

Accepted Answer

A) a waterfall. 
B) steam from a turbine. 
C) wind. 
D) any of these 
E) none of the above 
A) a waterfall. 
B) steam from a turbine. 
C) wind. 
D) any of these 
E) none of the above

Question 10

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) both. 
D) none of the above 
A) current is increased. 
B) the number of loops of wire in the coil increases. 
C) both. 
D) none of the above

Question 11

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

Accepted Answer

A) electric field intensity in the coil. 
B) magnetic field intensity in the coil. 
C) voltage in the coil. 
D) the coil's polarity. 
E) electromagnetic polarity. 
A) electric field intensity in the coil. 
B) magnetic field intensity in the coil. 
C) voltage in the coil. 
D) the coil's polarity. 
E) electromagnetic polarity.

Question 12

Superconducting electromagnets

Accepted Answer

A) exist now. 
B) may be possible in the near future. 
C) are not possible. 
D) are science fiction. 
A) exist now. 
B) may be possible in the near future. 
C) are not possible. 
D) are science fiction.

Question 13

Transformers use ac so there will be the required

Accepted Answer

A) transfer of energy from coil to coil. 
B) voltage for transformation. 
C) change in magnetic field for operation. 
D) change in input current. 
E) magnetic field intensities. 
A) transfer of energy from coil to coil. 
B) voltage for transformation. 
C) change in magnetic field for operation. 
D) change in input current. 
E) magnetic field intensities.

Question 14

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. 
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. 
D) frequency of domains in the magnetic part of the wave.

Question 15

When the current in a wire is reversed, the direction of the surrounding magnetic field

Accepted Answer

A) also reverses. 
B) remains steady. 
C) collapses. 
A) also reverses. 
B) remains steady. 
C) collapses.

Question 16

How are electric motors and electric generators similar? Different?

Accepted Answer

Both electric motors and generators are

Question 17

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 18

The magnetic field lines about a current-carrying wire form

Accepted Answer

A) circles. 
B) radial lines. 
C) eddy currents. 
D) spirals. 
A) circles. 
B) radial lines. 
C) eddy currents. 
D) spirals.

Question 19

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 20

The minimum magnetic force on a moving electron occurs for motion

Accepted Answer

A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) at an angle other than 90° to the magnetic field. 
A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) at an angle other than 90° to the magnetic field.

Exam 9: Magnetism and Electromagnetic Induction

Every magnet contains at least

What happens to a current-carrying wire in a magnetic field? How does orientation of the wire make a difference?

Break a bar magnet in half and each half is

A magnetic field easily penetrates

Changing the magnetic field intensity in a closed loop of wires induces

A magnet will become weaker if it is

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

A galvanometer measures

The energy source for a generator may be

The magnetic field inside a current-carrying coil increases when

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

Superconducting electromagnets

Transformers use ac so there will be the required

The frequency of a generated electromagnetic wave matches the

When the current in a wire is reversed, the direction of the surrounding magnetic field

How are electric motors and electric generators similar? Different?

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 magnetic field lines about a current-carrying wire form

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

The minimum magnetic force on a moving electron occurs for motion

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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