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Magnet

Total questions: 30

Worksheet time: 39mins

Name
Class
Date
1.

The magnetic field produced by a long straight current-carrying wire is

a)

proportional to both the current in the wire and the distance from the wire

b)

proportional to the current in the wire and inversely proportional to the distance from the wire.

c)

inversely proportional to the current in the wire and proportional to the distance from the wire.

d)

inversely proportional to both the current in the wire and the distance from the wire.

2.

The strongest parts of the magnet are ...

a)

fronts

b)

backs

c)

poles

d)

middle

3.

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

a)

plastic

b)

iron or steel

c)

glass

d)

copper

4.

What would happen if you touched a south pole end of a magnet to a north pole end of another magnet?

a)

they would be attracted to each other

b)

they would be repelled from each other

5.

What is the purpose of a compass?

a)

to tell you directions

b)

to tell how far you have walked

c)

to tell what time you left

d)

to tell where the sun is

6.

What would happen is a north pole of a magnet came close to a north pole of another magnet?

a)

they would be attracted to each other

b)

they would be repelled from each other

7.

The middle of the magnet is the ________________ point.

a)

hottest

b)

coldest

c)

weakest

d)

strongest

8.

The area around a magnet is called the .....

a)

attraction zone

b)

work area

c)

magnetic field

d)

hot zone

9.

Which direction does a compass always point?

a)

north

b)

south

c)

east

d)

west

10.

The diagram shows an arrangement of three magnets. The poles of the magnets are labelled A, B, C, D, E and F respectively.


Which one of the following arrangements of the three magnets is possible?

a)
b)
c)
d)
11.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
12.
Amy used a magnet to hold one piece of paper on the refrigerator. Later, she tried to use the same magnet to hold a stack of four pieces of paper, and the magnet wouldn't stick to the fridge. Why did this happen?
a)
The magnet needs glue
b)
The magnet couldn't hold due to the thickness of the paper
c)
Paper repels magnets
d)
A magnet isn't attracted to the refrigerator.
13.
What is Magnetism?
a)
A Tesla car
b)
An Electric Magnet
c)
A Force where objects are attracted to each other or repelled
d)
A magical force
14.
What happens when two bar magnets repel each other?
a)
The poles of the magnets pull toward each other.
b)
The poles of the magnets push away from each other.
c)
The centers of the magnets pull toward each other.
d)
The centers of the magnets push away from each other.
15.
How is a permanent magnet DIFFERENT from a temporary magnet?
a)
A permanent magnet can pick up paperclips.
b)
A permanent magnet has poles.
c)
A permanent magnet has a magnetic field.
d)
A permanent magnet keeps its magnetism for a long time.
16.
In this image, matching north poles from two magnets are introduced.  What do you predict will be the outcome?
a)
There will be no interaction.  The poles of magnets do not have an effect on one another.
b)
The two north poles will attract each other
c)
The two north poles will repel each other
d)
The two magnets will combine and become one magnet
17.
Earth acts like a giant magnet because its center is made up MOSTLY of
a)
granite
b)
limestone
c)
iron
d)
nickel
18.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
19.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
20.
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
21.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
22.
You can make an electromagnet stronger by...
a)
increasing the current through the wire
b)
make the iron core bigger
c)
increase the number of loops around the core
d)
All of these
23.
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
24.
Which direction is the North Pole of this electromagnet?
a)
Right
b)
Left
c)
Up
d)
Down
25.
Which direction is the North Pole of this electromagnet?
a)
Right
b)
Left
c)
Up
d)
Down
26.
A device that is able to reverse the direction of current in an electromagnet causing a motor to spin the opposite way is known as:
a)
a rotor
b)
a generator
c)
a magnet
d)
a commutator
27.
Where could you hold a south pole of a permanent magnet to get the rotor to move counter-clockwise?
a)
A & B
b)
B & C
c)
A & C
d)
B & D
28.
2 ways to increase the magnetic force of an electro-magnet
a)
Increase the current flow, reduce the number of coils
b)
Increase the voltage, decrease the number of coils
c)
Increase the number of coils and the current flow
d)
Spread out the coils, replace iron core with rubber.
29.
Electric current passing through a wire produces ________.
a)
permanent magnet
b)
magnetic field around wire
c)
compass
d)
geographic poles
30.

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will

a)

move in a straight line.

b)

follow a spiral path.

c)

move along a parabolic path.

d)

follow a circular path.

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