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Year 8 - Electromagnets

Total questions: 23

Worksheet time: 23mins

Name
Class
Date
1.
What subject is attracted to a magnet?
a)
Silver
b)
Water
c)
Metal
d)
Iron
2.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
3.
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
4.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
5.

A force of attraction or repulsion between the poles of two magnets.

a)

magnets

b)

magnetic poles

c)

magnetic force

d)

magnetic fields

6.

The invisible field that surrounds a magnet.

a)

magnets

b)

magnetic poles

c)

magnetic force

d)

magnetic fields

7.

a magnet that quickly loses its magnetic field after being removed from a magnetic field

a)

temporary magnet

b)

permanent magnet

8.

a magnet that remains a magnet after being removed from a magnetic field

a)

temporary magnet

b)

permanent magnet

9.
Why does a compass needle point north?
a)
The compass is a bar magnet
b)
Because north is up
c)
Because it's magic
d)
It lines up with the Earth's magnetic field
10.
A _______________ is a current-carrying coil of wire with many loops
a)
electromagnet
b)
solenoid
c)
magnet
d)
compass
11.
The strength of a magnet can be changed by
a)
adding less loops to the coil.
b)
adding more loops to the coil.
12.
The strength of an electromagnet can be affected by
a)
changing the current in the wire
b)
changing the space between the wires
c)
all of the above
d)
none of the above
13.
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
d)
excited, hair, apple
14.
How do electromagnets differ from regular magnets? 
a)
A. They  can be turned off and on 
b)
B. Their polarity can be reversed
c)
C. Their strength can be changed
d)
D. All of the above
15.
Electromagnets can be found in...
a)
Doorbell
b)
Computer drive
c)
Electric train
d)
All of them 
16.
Where does a magnetic field occur in relation to an electrified wire? 
a)
At either end, but not in the middle
b)
Only the side closest to source
c)
Around the entire length of wire
d)
Only the side furthest from source
17.
Why are paper clips attracted to magnets?
a)
They contain silver.
b)
They contain aluminum
c)
They contain tin.
d)
They contain iron. 
18.
What is the metal center of an electromagnet called?
a)
The current
b)
the wire
c)
the coil
d)
the core
19.

Which two of the following items are permanent magnets?

a)

electromagnet

b)

bar magnet

c)

metal detector

d)

electric motors

e)

fridge magnet

20.

Jamal is investigating magnetism. He wants to keep two magnets from attracting by changing their magnetic field. Which material should Jamal put in between the two magnets?

a)

warm air

b)

cold water

c)

thick metal

d)

thin paper

21.

What will most likely have to happen for an electromagnet to drop a car?

a)

A bar magnet will have to be placed underneath the car to cancel the magnetic force.

b)

The driver will have to place a non-metal object between the magnet and the car.

c)

The driver will have to heat the magnet to the point where it no longer has a magnetic force.

d)

The electric current that is creating the magnetic force will have to be turned off.

22.

Which device should be built using a bar magnet instead of an electromagnet?

a)

a magnetic door lock that needs to be able to be unlocked

b)

a stereo speaker that needs to be able to vary the volume

c)

a blender that needs to be able to vary speeds

d)

a fridge door that needs to stay closed

23.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).

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