Question 1

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 2

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

Accepted Answer

Sunshine is light,which is part of the e

Question 3

Compared with the voltage input to a transformer,the voltage output can be

Accepted Answer

A) greater. 
B) less. 
C) greater or less. 
A) greater. 
B) less. 
C) greater or less.

Question 4

The ultimate source of all magnetism is

Accepted Answer

A) tiny bits of iron. 
B) tiny domains of aligned atoms. 
C) ferromagnetic materials. 
D) moving electric charge. 
A) tiny bits of iron. 
B) tiny domains of aligned atoms. 
C) ferromagnetic materials. 
D) moving electric charge.

Question 5

A compass needle in a magnetic field experiences

Accepted Answer

A) a torque. 
B) a net force. 
C) both of these 
D) none of the above 
A) a torque. 
B) a net force. 
C) both of these 
D) none of the above

Question 6

When a bar magnet is thrust into a coil of wire,a greater voltage is induced with

Accepted Answer

A) a greater number of loops in the coil. 
B) faster thrusting motion. 
C) a stronger bar magnet. 
D) all of the above 
A) a greater number of loops in the coil. 
B) faster thrusting motion. 
C) a stronger bar magnet. 
D) all of the above

Question 7

State and explain Faraday's law of induction.

Accepted Answer

Faraday's law states that voltage induce

Question 8

Since magnetic force on a moving electron is always perpendicular to its direction of motion,magnetic force is unable to change an electron's

Accepted Answer

A) speed. 
B) direction. 
C) speed and direction. 
D) none of the above 
A) speed. 
B) direction. 
C) speed and direction. 
D) none of the above

Question 9

Changing the magnetic field intensity in a copper coil induces

Accepted Answer

A) current. 
B) voltage. 
C) both of these 
D) none of the above 
A) current. 
B) voltage. 
C) both of these 
D) none of the above

Question 10

A current of 4 A exist in the primary coil of a transformer powered with 110 V.What is the power output of the secondary coil?

Accepted Answer

A) 27.5 W 
B) 110 W 
C) 440 W 
D) 880 W 
E) not enough information 
A) 27.5 W 
B) 110 W 
C) 440 W 
D) 880 W 
E) not enough information

Question 11

Electric and magnetic fields combine to produce

Accepted Answer

A) sound. 
B) light. 
C) both of these 
D) none of the above 
A) sound. 
B) light. 
C) both of these 
D) none of the above

Question 12

Refrigerator magnets are typically

Accepted Answer

A) short range. 
B) long range. 
C) none of these 
A) short range. 
B) long range. 
C) none of these

Question 13

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 non-right angles 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 non-right angles to the magnetic field direction. 
E) none of the above

Question 14

Compared with the power input to an ideal transformer,the power output is

Accepted Answer

A) greater. 
B) less. 
C) either greater or less. 
D) the same. 
A) greater. 
B) less. 
C) either greater or less. 
D) the same.

Question 15

Power is the rate at which

Accepted Answer

A) energy is transferred. 
B) voltage can be changed. 
C) current can be induced. 
A) energy is transferred. 
B) voltage can be changed. 
C) current can be induced.

Question 16

Unlike electric charges,magnetic poles cannot be

Accepted Answer

A) located. 
B) isolated. 
C) destroyed. 
A) located. 
B) isolated. 
C) destroyed.

Question 17

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 18

An ideal transformer has 50 turns in the primary and 500 turns in the secondary.An input of 12 V will produce an output of

Accepted Answer

A) 12 V. 
B) 120 V. 
C) 1200 V. 
D) none of the above 
A) 12 V. 
B) 120 V. 
C) 1200 V. 
D) none of the above

Question 19

An efficient step-up transformer increases

Accepted Answer

A) power. 
B) energy. 
C) both of these 
D) none of the above 
A) power. 
B) energy. 
C) both of these 
D) none of the above

Question 20

No net force acts on a loop of wire in a magnetic field when

Accepted Answer

A) no current is in the loop. 
B) no magnetic field lines pass through the loop. 
C) both of these 
D) neither of these 
A) no current is in the loop. 
B) no magnetic field lines pass through the loop. 
C) both of these 
D) neither of these

Exam 9: Magnetism and Electromagnetic Induction

Transformers use ac so there will be the required

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

Compared with the voltage input to a transformer,the voltage output can be

The ultimate source of all magnetism is

A compass needle in a magnetic field experiences

When a bar magnet is thrust into a coil of wire,a greater voltage is induced with

State and explain Faraday's law of induction.

Since magnetic force on a moving electron is always perpendicular to its direction of motion,magnetic force is unable to change an electron's

Changing the magnetic field intensity in a copper coil induces

A current of 4 A exist in the primary coil of a transformer powered with 110 V.What is the power output of the secondary coil?

Electric and magnetic fields combine to produce

Refrigerator magnets are typically

Maximum magnetic force occurs when electrons move

Compared with the power input to an ideal transformer,the power output is

Power is the rate at which

Unlike electric charges,magnetic poles cannot be

A magnet will become weaker if it is

An ideal transformer has 50 turns in the primary and 500 turns in the secondary.An input of 12 V will produce an output of

An efficient step-up transformer increases

No net force acts on a loop of wire in a magnetic field when

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

Filters