Question 1

The voltage across the input terminals of a transformer is 110 V.The primary coil has 50 loops and the secondary has 25 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 B

Question 2

A turbogenerator produces

Accepted Answer

A) energy. 
B) power. 
C) neither,but transforms energy from one form to another. 
D) none of the above 
A) energy. 
B) power. 
C) neither,but transforms energy from one form to another. 
D) none of the above C

Question 3

If a magnet produces a force on a current-carrying wire,the wire

Accepted Answer

A) produces a force on the magnet. 
B) may or may not produce a force on the magnet. 
C) neither of these 
A) produces a force on the magnet. 
B) may or may not produce a force on the magnet. 
C) neither of these A

Question 4

If you break a bar magnet in half you'll

Accepted Answer

A) destroy its magnetic properties. 
B) have two magnets. 
C) have four magnets. 
D) none of the above 
A) destroy its magnetic properties. 
B) have two magnets. 
C) have four magnets. 
D) none of the above

Question 5

What any type of field generation cannot create is

Accepted Answer

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

Question 6

The rapid change of an electric field induces

Accepted Answer

A) a stronger electric field. 
B) a magnetic field. 
C) both of these 
D) none of the above 
A) a stronger electric field. 
B) a magnetic field. 
C) both of these 
D) none of the above

Question 7

The magnetic field lines about a straight current-carrying wire are

Accepted Answer

A) circular. 
B) radial. 
C) elliptical. 
D) spiral. 
A) circular. 
B) radial. 
C) elliptical. 
D) spiral.

Question 8

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 9

Compared with a motor,a generator is

Accepted Answer

A) one and the same. 
B) its opposite. 
C) of an entirely different design. 
A) one and the same. 
B) its opposite. 
C) of an entirely different design.

Question 10

A device that transforms electrical energy to mechanical 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 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 12

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

Question 13

The rate at which energy is transferred is

Accepted Answer

A) power. 
B) electromagnetic induction. 
C) transformation. 
D) none of the above 
A) power. 
B) electromagnetic induction. 
C) transformation. 
D) none of the above

Question 14

Electromagnetic induction is employed in

Accepted Answer

A) credit card readers. 
B) computers. 
C) mobile phones. 
D) all of the above 
E) none of the above 
A) credit card readers. 
B) computers. 
C) mobile phones. 
D) all of the above 
E) none of the above

Question 15

A transformer actually transforms

Accepted Answer

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

Question 16

Wood does not have magnetic properties because it contains no

Accepted Answer

A) iron or other metals. 
B) magnetic domains. 
C) moving electrons. 
D) none of the above 
A) iron or other metals. 
B) magnetic domains. 
C) moving electrons. 
D) none of the above

Question 17

A galvanometer is a useful device in electric

Accepted Answer

A) electromagnets. 
B) transformers. 
C) generators and motors. 
D) meters. 
E) none of the above 
A) electromagnets. 
B) transformers. 
C) generators and motors. 
D) meters. 
E) none of the above

Question 18

A strong magnetic field easily penetrates

Accepted Answer

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

Question 19

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

Accepted Answer

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

Question 20

A superconducting electromagnet makes use of

Accepted Answer

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

Exam 9: Magnetism and Electromagnetic Induction

The voltage across the input terminals of a transformer is 110 V.The primary coil has 50 loops and the secondary has 25 loops.The output is

A turbogenerator produces

If a magnet produces a force on a current-carrying wire,the wire

If you break a bar magnet in half you'll

What any type of field generation cannot create is

The rapid change of an electric field induces

The magnetic field lines about a straight current-carrying wire are

The energy source for a generator may be

Compared with a motor,a generator is

A device that transforms electrical energy to mechanical energy is a

A galvanometer measures

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

The rate at which energy is transferred is

Electromagnetic induction is employed in

A transformer actually transforms

Wood does not have magnetic properties because it contains no

A galvanometer is a useful device in electric

A strong magnetic field easily penetrates

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

A superconducting electromagnet makes use of

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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