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Electromagnetism

Total questions: 123

Worksheet time: 2hrs 54mins

Name
Class
Date
1.

​If you are a scientist, what is your conclusion?

4 lines
2.

Did we do any lab that shows the interaction between electricity and magnetic field? What is it?

(a)  

3.

A magnet will pick up an object that is made of...

a)

plastic

b)

iron or steel

c)

glass

d)

copper

4.
How do you make an electromagnet stronger?
a)
Add a motor and/or lightbulbs
b)
Add more light bulbs and/or wire coils
c)
add more wire coils and/or a switch
d)
add more wire coils and/or batteries
5.
What is true about electricity and magnetic fields?
a)
Electricity is needed to create any magnet.
b)
Electricity always creates a magnetic field.
c)
Electricity is stronger than a magnetic field.
d)
Electricity prevents magnetic fields from occurring.
6.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
7.
A compass needle responds to a magnetic field, because the compass needle is a
a)
A. generator.
b)
B. motor.   
c)
C. magnet.
d)
D. transformer.
8.

Which sides of the magnet repel each other?

a)

A) North and North Pole

b)

B) South and South Pole

c)

C) The North and South Pole

d)

D) A and B

e)

E) A, B,C

9.

What happens when an electric current flows through a wire?

a)

The wire begins to spin.

b)

Nothing happens.

c)

A field of gravity is created around the wire.

d)

A magnetic field is created around the wire.

10.

How do you describe electromagnetism?

4 lines
11.

The diagram shows a device made up of a battery, some wire, and an iron core. Which type of device is shown?

a)

an electric generator

b)

a permanent bagnet

c)

a bar magnet

d)

an electromagnet

12.

Which machine uses magnetism to produce electricity?

a)

electromagnet

b)

electric generator

c)

motor

d)

compass

13.

Which objects would you combine to build an electromagnet?

a)

compass, source of electric current, copper wire

b)

battery, generator, steel screw

c)

copper wire, source of electric current, steel screw

d)

battery, light bulb, plastic straw

14.

What will happen if a bar magnet is moved through a coil of wire?

a)

The bar magnet will lose its magnetism.

b)

An electric current will be generated in the wire.

c)

The wire will become an electromagnet.

d)

An electric current will be generated in the magnet.

15.

Which diagram best identifies how an electric current is produced?

a)
b)
c)
d)
16.

In an electromagnet, a current is passed through loops of wire that surround a core.  Which material would be best to use as the core of an electromagnet?

a)

aluminum paper clip

b)

pen

c)

piece of chalk

d)

an iron nail

17.

A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity?

a)

The student connects the copper wire to a light bulb.

b)

The student insulates the copper wire with plastic.

c)

The student uses a horseshoe magnet instead of a bar magnet.

d)

The student moves the bar magnet through the copper wire coils.

18.

Which diagram best represents the lines of the magnetic field that pass through Points 1 and 2 of the electromagnet?

a)
b)
c)
d)
19.

Which diagram represents a magnet creating an electric current?

a)
b)
c)
d)
20.

Which statement best compares a permanent magnet and an electromagnet?

a)

A permanent magnet has a north pole and a south pole, but an electromagnet only has a south pole.

b)

A permanent magnet has a fixed magnetic field strength but the magnetic field strength of an electromagnet can be changed.

c)

A permanent magnet requires an external source of energy, but an electromagnet produces its own energy.

d)

The magnetic field lines from a permanent magnet emerge from the north pole, but they emerge from the south pole of the electromagnet.

21.

The strongest parts of the magnet are ...

a)

fronts

b)

backs

c)

poles

d)

middle

22.

Which of the following is not a subatomic particle that makes up an atom?

a)

neutron

b)

proton

c)

nucleon

d)

electron

23.

Protons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

24.

Electrons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

25.

Why does the compass needle move at different locations?

a)

Because the needle is attracted to the magnetic field produced by the magnet

b)

Because north is up

c)

Because it is being attracted to the Magnetic North Pole

d)

Because north is down

26.

These magnetic domains are:

a)

strongly magnetized

b)

slightly magnetized

c)

unmagnetized

27.
The picture is an example of an:
a)
Electric circuit
b)
Electromagnet
c)
Electric nail
d)
Electric power cell
28.

To make this electromagnet stronger you could:

a)

use less wire

b)

have fewer wire coils around the nail

c)

have more wire coils around the nail

d)

use a plastic core

29.

When running a current through a wire, what do the blue lines represent?

a)

The wire spinning

b)

A magnetic field that was created

c)

Electrons leaving

d)

Electricity

30.

Which one represents the magnetic field lines of magnets repelling?

a)

A

b)

B

31.

Which one represents the magnetic field lines of magnets attracting?

a)

A

b)

B

32.

This picture best illustrates the construction of a(n)

a)

magnet

b)

electromagnet

c)

series circuit

d)

parallel circuit

33.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
34.

Particles with opposite charges ​ (a)   and particles with same (or like) charges ​ (b)   .

Choose from the below words
attract
repel
35.

The relationship between electricity and magnetism is called _____________.

a)

Electricity

b)

Law of Conservation of Energy

c)

Electromagnetism

d)

Magnetism

36.

A _______________ is a coil that carries an electric current. 

a)

Solenoid

b)

Simple Electric Motor

c)

Electromagnet

d)

Generator

37.

What can be done to increase the number of magnetic objects that an electromagnet picks up?

a)

Make the wire longer

b)

Remove the nail from the center of the wire

c)

Increase the number of coils in the solenoid

d)

Spread the coils out across the nail

38.

Which of these is not a way to increase the magnetism of an electromagnet

a)

Increase the length of the wire.

b)

Increase the thickness of the wire.

c)

Decrease the distance to the power source.

d)

Increase the distance to the power source.

39.

Which of these is not an example of an electromagnet.

a)

Refrigerator Magnet

b)

Speakers

c)

Computer Hard Drive

d)

Generators

40.

(Choose all that apply) Which of these would decrease the power of an electromagnet?

a)

Decrease the distance to the power source.

b)

Decrease the thickness of the wire.

c)

Decrease the amount of current running through the wire.

d)

Decrease the length of the wire.

41.

(True of False) An electromagnet is still a magnet when there is not current running through it.

a)

True

b)

False

42.

How can you increase the magnetic field strength in an electromagnet?

a)

Increase the number of coils.

b)

increase the voltage

c)

increase the current by reducing the resistance of the coil

d)

all of the above

43.

If you brought an unknown pole of a magnet near a North magnetic pole and they repel what is the unknown pole?

a)

North

b)

South

c)

Neutral

d)

not enough information

44.

Magnetic field lines around a bar magnet


(a)  
Choose from the below words
spread out from one pole and curve around to the other.
are only perpendicular to the magnet
cross back and forth over one another.
are perfectly straight.
45.

Every magnet, regardless of its shape, has two


(a)  
Choose from the below words
magnetic poles.
magnetic charges.
magnetic fields.
magnetic needles.
46.

Magnetic poles that are unlike


(a)  
Choose from the below words
attract each other.
repel each other.
do not interact.
point in the same direction.
47.

What is one difference between a galvanometer and an electric motor?

a)

An electric motor causes something to move.

b)

A galvanometer uses an electric current.

c)

In an electric motor, the armature spins continuously.

d)

An electric motor uses electrical energy.

48.

To reverse the direction of current in a motor, current is conducted


(a)  
Choose from the below words
through the brushes to the commutator.
through the armature
in the direction of rotation.
through the commutator to the armature.
49.

The type of current produced by a battery is


(a)  
Choose from the below words
direct current.
alternating current.
magnetic current.
induced current.
50.

You can increase the strength of an electromagnet’s field by


(a)  
Choose from the below words
using a stronger ferromagnetic material for the core.
decreasing the current in the solenoid.
decreasing the number of loops in the solenoid.
winding the coils more loosely.e
51.

As Earth’s magnetic poles move, the magnetic declination in a given location will


(a)  
Choose from the below words
change.
stay the same.
switch to point south.
return to zero.
52.

An electric current produces

(a)  

Choose from the below words
a magnetic field.
a magnet.
a solenoid
an insulator.
53.

Electric current from a generating plant is


(a)  
Choose from the below words
alternating current transmitted at high voltages, but usually used at low voltages.
direct current transmitted at high voltages, but usually used at low voltages.
alternating current transmitted at low voltages, but usually used at high voltages.
direct current transmitted at low voltages, but usually used at high voltages.
54.

A maglev train floats above its rails due to (a)   .

55.

When a wire moves up or down repeatedly in a(n) (a)   , an alternating current is induced in the wire.

56.

A step-up transformer is a transformer that increases (a)   .

57.

A(n) (a)   is a strong magnet that can be turned on and off.

58.

A magnetic pole is the part of a magnet where the magnetic effect is ​ (a)   .

Choose from the below words
strongest
weakest
59.

A compass behaves as it does because ​ (a)   acts as a giant magnet.

Choose from the below words
Earth
the moon
the sun
60.

A DC generator is like an AC generator, except that it contains a(n) (a)   instead of slip rings.

61.

Increasing the number of loops in a solenoid will cause the strength of its magnetic field to ​ (a)   .

Choose from the below words
increase
decrease
62.

Magnets attract ​ (a)   .

Choose from the below words
iron
metals
wood
fabric
63.

According to the diagram, the upper loop of the wire will move ​​ (a)   .

Choose from the below words
downward
upward
left
right
forward
backward
64.

if the direction of the current were reversed, the wire move ​ (a)   .

Choose from the below words
upward
left
right
forward
backward
downward
65.

What common electrical device is shown in the diagram?

a)

an electric motor

b)

a DC generator

c)

a galvanometer

d)

an AC generator

66.

Look at the circular arrow in the diagram. The side of the loop closest to the​ (a)   magnetic pole is moving up.

Choose from the below words
south
north
67.

Describe two ways of causing the loop to rotate in the opposite direction in the diagram.

4 lines
68.

Electron

a)

Has a positive charge

b)

Has a negative charge

c)

The gain of electrons

d)

The loss of electrons

69.

Proton

a)

Has a positive charge

b)

Has a negative charge

c)

the gain of electrons

d)

the loss of electrons

70.

Positive Charge

a)

Has a positive charge

b)

Has a negative charge

c)

the gain of electrons

d)

the loss of electrons

71.

Negative Charge

a)

Has a positive charge

b)

has a negative charge

c)

the gain of electrons

d)

the loss of electrons

72.

Magnetic Forces

a)

attractive and repulsive forces between two poles (power)

b)

occur when ions create attractive and repulsive forces

c)

made up of protons and electrons that produce an electric current when in motion

d)

moving charge

73.

Electric Current

a)

attractive and repulsive forces between two poles (power)

b)

occur when ions create attractive and repulsive forces

c)

made up of protons and electrons that produce an electric current when in motion

d)

moving charge

74.

Electric Charge

a)

attractive and repulsive forces between two poles (power)

b)

occur when ions create attractive and repulsive forces

c)

made up of protons and electrons that produce an electric current when in motion

d)

moving charge

75.

Electric Force

a)

attractive and repulsive forces between two poles (power)

b)

occur when ions create attractive and repulsive forces

c)

made up of protons and electrons that produce an electric current when in motion

d)

moving charge

76.

Electromagnetism

a)

invisible force created when electrons all spin in the same direction

b)

area around the poles of a magnet

c)

north or south end of a magnet

d)

force combining both magnetic and electric fields

77.

Magnetic Field

a)

invisible force created when electrons all spin in the same direction

b)

area around the poles of a magnet

c)

north or south end of a magnet

d)

force combining both magnetic and electric fields

78.

Magnetic Pole

a)

invisible force created when electrons all spin in the same direction

b)

area around the poles of a magnet

c)

north or south end of a magnet

d)

force combining both magnetic and electric fields

79.

Magnetism

a)

invisible force created when electrons all spin in the same direction

b)

area around the poles of a magnet

c)

north or south end of a magnet

d)

force combining both magnetic and electric fields

80.

Attract

a)

the action of opposite poles

b)

the action of same poles

c)

electrical energy to mechanical energy

d)

mechanical energy to electrical energy

81.

Repel

a)

the action of opposite poles

b)

the action of same poles

c)

electrical energy to mechanical energy

d)

mechanical energy to electrical energy

82.

Generator

a)

the action of opposite poles

b)

the action of same poles

c)

electrical energy to mechanical energy

d)

mechanical energy to electrical energy

83.

Motor

a)

the action of opposite poles

b)

the action of same poles

c)

electrical energy to mechanical energy

d)

mechanical energy to electrical energy

84.

Semiconductors

a)

process of generating an electric current with a magnetic field

b)

material through which charges can move freely

c)

special class of materials that conduct electric charge better than electric insulators but not as good as electric conductors

d)

material through which charges can not move easily

85.

Electric Conductor

a)

process of generating an electric current with a magnetic field

b)

material through which charges can move freely

c)

special class of materials that conduct electric charge better than electric insulators but not as good as electric conductors

d)

material through which charges can not move easily

86.

Electric Insulator

a)

process of generating an electric current with a magnetic field

b)

material through which charges can move freely

c)

special class of materials that conduct electric charge better than electric insulators but not as good as electric conductors

d)

material through which charges can not move easily

87.

Electromagnetic Induction

a)

process of generating an electric current with a magnetic field

b)

material through which charges can move freely

c)

special class of materials that conduct electric charge better than electric insulators but not as good as electric conductors

d)

material through which charges can not move easily

88.
_______ magnets have a North pole and a South pole.
a)
No
b)
Some
c)
All
d)
Broken
89.
The relationship between electricity and magnetism is called
a)
electrical energy.
b)
induced current.
c)
electromagnetism.
d)
ferromagnetism.
90.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
91.
Surrounding every magnet is a(n) __________  __________.
a)
magnetic field
b)
electrical current
c)
smaller magnet
d)
funny saying
92.
What kind of magnet can be turned on and off?
a)
a refrigerator magnet
b)
an electromagnet
c)
magnetite
d)
iron
93.
When two magnetic North poles are brought close to each other, they will
a)
attract
b)
repel
c)
create sparks
d)
cancel each other out
94.
When a magnetic South pole is brought close to a magnetic North pole, the magnets will
a)
attract
b)
repel
c)
create sparks
d)
cancel each other out
95.
When a magnet is able to move freely, its North pole will
a)
spin wildly
b)
point to the Earth's South pole
c)
point to the Earth's geographic North pole
d)
point to the Earth's magnetic North pole
96.
Which of the following is NOT magnetic?
a)
zinc
b)
iron
c)
cobalt
d)
nickel
97.
When magnetic field lines are drawn, how do they look?
a)
straight lines
b)
criss-crossed lines like X's
c)
curved lines from N to S pole and outwards
d)
lines extending outward in all directions like drawing the Sun
98.

Electric currents passing through wires will produce a(n)

a)

solenoid

b)

magnet

c)

magnetic field

d)

insulator

99.

What makes an electromagnet different than a permanent magnet.....select all that apply

a)

it can be turned on and off

b)

it does not need any electricity

c)

its strength can be increased and decreased

d)

its polarity can be reversed

100.

What type of materials are needed to create an electromagnet?

a)

battery, light bulb, plastic straw

b)

battery, coil of wire, iron core

c)

generator, iron core, switch

d)

switch, source of electricity, compass

101.
What are the ends of a magnet called?
a)
East and west poles
b)
Left and Right ends
c)
North and South ends
d)
North and South poles
102.
The attraction or repulsion created by spinning electric charges is called -
a)
A. electric generator
b)
B. magnetic force
c)
C. solenoid
d)
D. electromagnet
103.
A compass needle responds to a magnetic field, because the compass needle is a
a)
A. generator.
b)
B. motor.   
c)
C. magnet.
d)
D. transformer.
104.

An electromagnet is a magnet that

a)

its strength can be varied and turned on and off

b)

always has a magnetic field around it

c)

has very little strength

105.

What are two ways to induce (begin) a current in a solenoid?

a)

Moving a bar magnet inside a solenoid

b)

Moving a solenoid inside a magnetic field

c)

Setting a ferromagnetic material near a solenoid

d)

Resting a magnet in a solenoid

106.

If the needle on a galvanometer is not moving this means there is no _______ _________

a)

Electrical current

b)

Magnetic field lines

c)

Gravitational field

d)

Quantum Field

107.

Which factor will NOT affect the magnitude (size) of an induced electrical current?

a)

The amount of coils used

b)

The speed of the magnet movement

c)

the strength of the magnet

d)

The direction the magnet is moving

108.

Which lightbulb will have the greatest electrical current induced?

a)

A

b)

B

c)

C

d)

D

109.
How could the experimenter increase the amount of electricity being induced by this experiment?
a)
Increase the number of coils
b)
Decrease the number of coils
c)
Flip the magnet around
d)
Nothing, the amount of electricity cannot be increased
110.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear 
b)
The magnet would explode 
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
111.

Which action will increase the deflection of the galvanometer pointer?

a)

The magnetic pole is reversed

b)

The number of turns of coils is increased

c)

The coil is made from insulated wire

d)

The magnet is slowly pushed into the coil

112.

What type of energy does a generator produce?

a)

Electrical

b)

gravitational

c)

Magnetic

d)

No force

113.

What converts electrical energy into mechanical energy?

a)

Electric Motor

b)

Generator

114.

What does a power plant use to produce electricity?

a)

Generators

b)

Electric motors

115.

A ____________ is responsible for changing the direction of current in an electric motor.

a)

Commutator

b)

Solenoid

c)

Ferromagnet

d)

Electromagnet

116.

What type of input does a generator require to produce electricity?

a)

Mechanical

b)

Electrical

c)

Magnetic

d)

Gravitational

117.

What type of input does a generator require to produce electricity?

a)

Mechanical

b)

Electrical

c)

Magnetic

d)

Gravitational

118.

What does a power plant use to produce electricity?

a)

Generators

b)

Electric motors

119.

What converts electrical energy into mechanical energy?

a)

Electric Motor

b)

Generator

120.

What type of energy does a generator produce?

a)

Electrical

b)

gravitational

c)

Magnetic

d)

No force

121.

What type of device is shown?

a)

Electromagnet

b)

motor

c)

generator

d)

Electromagnetic induction

122.

A generator converts ______ into ______.

a)

Electrical energy, mechanical energy

b)

mechanical energy, electrical energy

c)

electrical energy, solar energy

d)

Solar energy into electrical energy

123.

The following image is a.....

a)

Transformer

b)

Generator

c)

Motor

d)

Galvanometer

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