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WorksheetsF5 Chp3.1: Electromagnet
Total questions: 50
Worksheet time: 50mins
Name
Class
Date
1.
What is an electromagnet?
a)
a temporary magnet made from current carrying wire around a magnetic metal core.
b)
a permanent magnet with a north and south pole
2.
What makes an electromagnet stronger?
a)
Increase the number of wire wraps around the iron core
b)
decrease the strength of the power source
c)
remove the source of current
d)
lightning bolts hitting a tree
3.
What is the relationship between electrical current and magnetic field strength in an electromagnet?
a)
When current is increased, magnetic field strength increases
b)
When current is increased the strength of magnetic field decreases
4.
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.
5.
Which of the following is NOT part of an electromagnet?
a)
Wire
b)
Iron
c)
Toothpick
d)
Power source
6.
Which of the following is shown in the picture?
a)
Electromagnet
b)
Electric generator
c)
Electric motor
d)
Transformer
7.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
8.
What is magnetism?
a)
Energy created by magnets
b)
A force created by magnets
c)
A contact force
d)
An invisible force that attracts electrically charged particles
9.
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
10.
What is the name of the force that attracts or repels materials?
a)
current
b)
electricity
c)
magnetism
11.
Surrounding every magnet is a __________ __________.
a)
magnetic field
b)
electrical current
c)
another magnet
12.
If I were to try to connect the North pole of one magnet to the North pole of another magnet, the two poles would:
a)
attract
b)
repel
c)
neither
13.
If I were to try to connect the North pole of one magnet to the South pole of another magnet, the two poles would:
a)
attract
b)
repel
c)
neither
14.
In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.
a)
wire, iron, electric
b)
electric, wire, iron
c)
iron, electric, wire
15.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
16.
What happens when a wire is wound into a coil around an iron core in an electromagnet?
a)
the wire exolodes
b)
you get electricuted
c)
the magnetic field becomes stronger
d)
the magnetic field becomes weaker
17.
While electric current is flowing through a wire, what surrounds the wire?
a)
a magnetic field
b)
a glowing light
c)
neutrons
d)
protons
18.
When two magnets attract, they ______________
a)
push apart
b)
change color
c)
get colder
d)
pull together
19.
When two magnets repel, they ________________
a)
change color
b)
pull together
c)
push apart
d)
get colder
20.
Opposite magnetic forces _____ each other.
a)
Attract
b)
Repel
21.
A north pole and a south pole will attract.
a)
True
b)
False
22.
In order to make an electromagnet, you need a
a)
battery, nail, and magnet
b)
battery, wire, and nail
c)
magnet, nail, and wire
d)
all of the above
23.
What is the metal center of an electromagnet called?
a)
The current
b)
The wire
c)
The coil
d)
The core
24.
What is needed to make a simple electromagnet?
a)
sound
b)
wire
c)
magnets
d)
light energy
25.
What would increase the strength of an electromagnet?
a)
Increasing the amount of current flowing through the wire.
b)
Inserting a wooden core inside the coil
c)
Changing the direction of the current
d)
Decreasing the number of coils of wire
26.
A simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
When the current is turned off in an electromagnet, the _____________.
When the current is turned off in an electromagnet, the _____________.
a)
battery short-circuits
b)
magnetic field is weakened
c)
wire gains a positive charge
d)
core becomes more magnetic
27.
A simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by increasing the current through the coil.
The strength of magnetic force in an electromagnet is ______ by increasing the current through the coil.
a)
increased
b)
unaffected
c)
eliminated
d)
decreased
28.
A simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by decreasing the number of coils.
The strength of magnetic force in an electromagnet is ______ by decreasing the number of coils.
a)
increased
b)
unaffected
c)
eliminated
d)
decreased
29.
A simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by increasing the number of coils.
The strength of magnetic force in an electromagnet is ______ by increasing the number of coils.
a)
increased
b)
unaffected
c)
eliminated
d)
decreased
30.
If the direction of current in a wire is reversed the magnetic field will?
a)
continue in the same direction
b)
become weaker
c)
change direction
d)
become stronger
31.
You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
32.
You can make an electromagnet stronger by: using a __________________ material for the core.
a)
soft
b)
conducting
c)
magnetic
d)
hard
33.
What would happen if you broke a magnet in half?
a)
Nothing
b)
You would have two new pieces which would have a north and south pole
c)
Neither pole would be magnetic anymore
d)
You would have two magnets, one with only a north pole and the other with only a south pole
34.
The strength of the magnetic field of a electromagnet can be increased by
a)
Decreasing the number of coils.
b)
Increasing the number of coils
c)
Decreasing the current
d)
Increasing the resistance
35.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
36.
Which of the following is true of a bar magnet?
a)
Its magnetic field is strongest near its center.
b)
It is surrounded by a magnetic field.
c)
The north pole is stronger than the south pole.
d)
The south pole is stronger than the north pole.
37.
The area surrounding a magnet that is affected by the magnet's force is called a ____________.
a)
Magnetic Field
b)
Magnetic Area
c)
Magnetic Space
d)
Magnetic Range
38.
What happens when a wire is wound into a coil around an iron core in an electromagnet?
a)
the wire exolodes
b)
you get electrocuted
c)
the magnetic field becomes stronger
d)
the magnetic field becomes weaker
39.
What is an electromagnet?
a)
a magnet that creates an electric current
b)
a magnet created by an electric current
c)
a magnet that has an electric charge
d)
an electric charge that is magnetic
40.
___ Law says that the Induced current is proportional to the change of magnetic flux
a)
Lenz'
b)
Faraday's
c)
Ampere's
41.
Which description best applies to Lenz's Law?
a)
An induced current occurs when a magnet passes through a tube.
b)
When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
c)
The direction of an induced current is such to align with the change that created it.
d)
A magnet is a tube is always slowed by its magnetic field.
42.
Which activity will produce the highest current?
a)
Move the magnet bar into the coil while the coil remains stationery
b)
Move the coil into the magnet bar while the magnet remains stationery
c)
Move the coil and magnet towards each other
d)
Move the coil and magnet away from each other
43.
The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?
a)
Flip the magnet around so the North pole is facing out
b)
Move the magnet back and forth
c)
Take the magnet out
d)
Add more coils around the paper cylinder
44.
What is one way to increase the current in a wire?
a)
Decrease the number of coils
b)
Increase the number of coils
c)
Move the magnet slower
d)
Take the wire off of the magnet
45.
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
46.
What benefit is gained by the addition of the iron core in an electromagnet?
a)
It makes a strong magnet weaker
b)
It makes a weak magnet stronger
c)
There is no benefit at all
d)
It lets currents interact with each other
47.
Find the direction of the magnetic force.
a)
Into the screen
b)
Out of the screen
c)
Right
d)
Left
48.
Find the direction of the magnetic force.
a)
Down
b)
Into the screen
c)
Out of the screen
d)
Up
49.
13.7 Based on this picture, which side will have a higher voltage?
a)
Secondary
b)
Primary
c)
Both sides have the same voltage
d)
Cannot be determined
50.
Electromagnetic induction is change in ___________________.
a)
surface area
b)
magnetic poles
c)
magnetic flux
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