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Magnets and electromagnets

Total questions: 30

Worksheet time: 23mins

Name
Class
Date
1.

Which materials are magnetic?

a)

Wood

b)

Zinc

c)

Cobalt

d)

Aluminium

e)

All the Above

2.

What happen if you bring a north pole and a south pole together?

a)

The Repel

b)

They Attract

c)

The pull apart

d)

None of the Above

3.

Which direction does the magnetic field move towards?

a)

South to North

b)

North to South

c)

Left to Right

d)

Magnetic Fields to not move towards anywhere

4.

Which direction does the needle of a compass point to?

a)

North

b)

South

c)

East

d)

West

e)

None of the above

5.
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
6.
What is the metal center of an electromagnet called?
a)
The current
b)
the wire
c)
the coil
d)
the core
7.
What is magnetism?
a)
invisible objects coming together
b)
a force that either attracts or repels certain materials
c)
full of electricity
d)
metals
8.
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
9.
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.
10.
Which of the following is NOT part of an electromagnet?
a)
Wire
b)
Iron
c)
Toothpick
d)
Power source
11.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
12.
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
13.
What do two unlike poles do when they are brought close together?
a)
Nothing
b)
Repel
c)
Attract
d)
Decrease
14.
The arrow on magnetic field lines shows them flowing in which direction?
a)
Left to Right
b)
North to South
c)
South to North
d)
Right to Left
15.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
16.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
17.
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
a)
Clockwise
b)
Counter-clockwise
c)
It will not move
d)
Need more information
18.
Which direction is the North Pole of this electromagnet?
a)
Right
b)
Left
c)
Up
d)
Down
19.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
20.

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

a)

The magnetic field

b)

The electrostatic field

c)

The piezoelectric effect

d)

The chemical reaction of the magnet and the filings

21.

What device takes in mechanical energy and produces electricity?

a)

motor

b)

generator

c)

electromagnet

d)

battery

22.
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
23.
In un-magnetized materials the domains are __________ aligned.
a)
super
b)
slightly
c)
randomly
d)
always
24.
A simple electromagnet can be made with which of the following?
a)
an electric current
b)
a turbine and nail
c)
a nail, a wire, and a battery
d)
a compass and a battery
25.

What type of current is used?

a)

Direct

b)

Alternating

26.

What type of device is shown?

a)

Electromagnet

b)

Electric motor

c)

Electric generator

d)

Electromagnetic induction

27.
An electromagnet works because the iron nail becomes ___________.
a)
weakened by the battery
b)
magnetized by the battery
c)
electrical by the battery
d)
powered by the battery
28.

What two forces are required for generators and electric motors to work?

a)

magnetism and thermal

b)

electricity and thermal

c)

electricity and magnetism

d)

magnetism and radiant

29.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
30.
When two magnets attract, they ______________
a)
push apart
b)
change color
c)
get colder
d)
pull together

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