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Electromagnet Summary

Total questions: 70

Worksheet time: 1hrs 10mins

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.
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.
3.
Which of the following is NOT part of an electromagnet?
a)
Wire
b)
Iron
c)
Toothpick
d)
Power source
4.
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
5.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
6.
While electric current is flowing through a wire, what surrounds the wire?
a)
a magnetic field
b)
a glowing light
c)
neutrons
d)
protons
7.
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
8.
  You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
9.
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
10.
What is the metal center of an electromagnet called?
a)
The current
b)
The wire
c)
The coil
d)
The ferromagnetic core
11.
Bob made an electromagnet but it was very weak.  How can he make it stronger?
a)
take away a d-cell
b)
wrap the wire loosely
c)
use thicker wire
d)
use less winds
12.
Which rule explains why you would not use a brass rivet to make an electromagnet?
a)
opposites poles attract
b)
only iron and steel can become magnetized
c)
electricity flows from positive to negative
d)
metals conduct electricity
13.
Where does electricity flow in an electromagnet?
a)
through the insulation
b)
through the rivet
c)
through the air
d)
through the closed switch
14.
What component becomes a temporary magnet when electricity is flowing through the circuit?
a)
d -cell
b)
wire coil
c)
switch
d)
core
15.
What component provides the pathway to carry electricity from component to component?
a)
d cell
b)
wire
c)
switch
d)
wire coil
16.
Which component controls the flow of electricity by opening and closing the circuit?
a)
switch
b)
d cell
c)
wire coil
d)
core
17.
You are making an electromagnet and can choose from a copper, iron or steel rivet.  Which sentence is true?
a)
You can use all of them because they are all made of metal
b)
You can use either iron or steel.
c)
You can only use the iron rivet.
d)
You can only use the copper rivet.
18.
Samuel Morse, the inventor of the telegraph had a problem.  How can he increase the strength of the electromagnet in his telegraph?
a)
use thinner wire
b)
add more d-cells
c)
add a switch
d)
wind fewer wraps of wire around core
19.
Tim made an electromagnet with one d-cell and wrapped an uninsulated wire 30 times.  It did not work.  How could he fix it?
a)
wrap the wire more times
b)
include a switch
c)
use insulated wire
d)
use another d-cell
20.
What effect will the south pole of one magnet have on the south pole of another magnet?
a)
Repulsive
b)
Attractive
c)
Combative
d)
No effect
21.
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.
22.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
23.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
24.
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
25.
What is most likely to happen when the switch is closed?
a)
A magnetic field should be produced
b)
The nail will rust
c)
The battery will explode
d)
The wire will catch on fire
26.
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
27.
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
28.
Any material that attracts iron or materials containing iron is a(n) 
a)
A. electric generator
b)
B. solenoid
c)
C. magnet
d)
D. magnetic force
29.
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
30.
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.
31.
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
32.
Why are paper clips attracted to magnets?
a)
They contain silver.
b)
They contain aluminum
c)
They contain tin.
d)
They contain iron. 
33.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
34.

What type of device is being shown?

a)

Electromagnet

b)

Electric motor

c)

Electric generator

d)

Electromagnetic Induction

35.

What type of process is shown?

a)

Electromagnet

b)

Electric motor

c)

Electric generator

d)

Electromagnetic induction

36.

If you were to make a motor stronger, what should you do?

a)

Decrease the voltage

b)

Increase the voltage

c)

Disconnect the wires from the batteries

d)

Use a wooden rod instead of a wire

37.

What is a possible power source of a generator?

a)

Fan

b)

Plug

c)

Battery

38.

What type of device is shown?

a)

Electromagnet

b)

Electric motor

c)

Electric generator

d)

Electromagnetic induction

39.

Which electromagnet would be stronger?

a)

Left

b)

Right

40.

What type of current is being produced?

a)

Alternating

b)

Direct

41.
In Flemings Left hand rule what does the thumb point in the direction of?
a)
The direction of the magnetic field
b)
The direction of the current
c)
The direction of the force (movement)
d)
None of these
42.
The current in the green wire flows from the left to the right. What direction does the wire move?
a)
Up 
b)
Down
c)
Into the page
d)
Out of the page
43.
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
44.
How is an electromagnet different from a permanent magnet?
a)
An electromagnet is smaller and less powerful.
b)
An electromagnet's magnetism can be turned off.
c)
An electromagnet can be built without using metal.
d)
An electromagnet does not attract objects containing iron.
45.
In Flemings Left Hand Rule, in what direction does the second (middle) finger point? (The first finger is the one by your thumb
a)
The direction of movement
b)
The direction of the magnetic field
c)
The direction of electrical current
d)
The direction of electron flow
46.

Step-up transformers...

a)

improve the efficiency of the national grid

b)

reduce the voltage to a safe level for the home

c)

increase resistance

d)

are better than the Autobots

47.

The diagram show the direction of magnetic field,B and current, I.

By using Fleming left hand rules, determine the direction of Magnetic force, F.

a)

no force produced

b)

right

c)

into the page

d)

out from the page

48.

The diagram show the direction of magnetic field,B and current, I.

By using Fleming left hand rules, determine the direction of Magnetic force, F.

a)

no force produced

b)

right

c)

downward

d)

out from the page

49.

The diagram shows a cross-section through a simple DC motor. Select the correct statement:

a)

The loop will rotate clockwise

b)

The loop will rotate anticlockwise

c)

The slip rings aid commutation

d)

The loop rotates the same way even if the battery is reveresed

50.

If a conductor is wound into a coil and a current is passed through it creating a magnetic field, what is it known as?

a)

Bar Magnet

b)

Solenoid

c)

Polarnoid

d)

Transformer

51.

Why might a current-carrying wire be placed between a magnetic field?

a)

To increase the current from the interaction of magnetic fields

b)

To increase the voltage from the interaction of magnetic fields

c)

To produce a force from the interaction of magnetic fields

52.

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

a)

180

b)

45

c)

90

d)

270

53.

How does a split ring commutator work?

a)

Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

b)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

c)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

54.
If the current is going up on the front side of the coil then what side of the electromagnet is north?
a)
Up
b)
Down
c)
Left
d)
Right
55.

Using the right hand grip rule, A represents the direction of the

a)

current

b)

magnetic field

56.

Diagram above shows a solenoid. Which of the following rules may be used to determine the direction of the current in the coil?

a)

Fleming’s Left Hand Rule

b)

Fleming’s Right Hand Rule

c)

Right Hand Screw Rule

d)

Right Hand Grip Rule

57.

b) based on the diagram above, choose the direction of the forces that act on the sides AB and CD of the coil.

a)

AB:UPWARD;CD:DOWNWARD

b)

AB:DOWNWARD;CD:UPWARD

58.

The figure shows the structure of a motor. Which of the following will not affect the speed of rotation of the motor?

a)

The current in the coil

b)

Strength of the magnetic field

c)

The number of turns of wire in the coil

d)

The direction of the current in the coil

59.

How does a split ring commutator work?

a)

Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

b)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

c)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

60.

What is the functions of commutator?

a)

Reverse the direction of current in the coil every half rotation so that the coil continues to turn in same direction

b)

To contact with the commutator so the current from the battery enters the coil.

c)

Push the brush so it will always contact with the commutator.

61.

Diagram shows a dc motor. What is the functions of brush carbon?

a)

Push the brush so it will always contact with the commutator.

b)

To contact with the commutator so the current from the battery enters the coil.

c)

Reverse the direction of current in the coil every half rotation so that the coil continues to turn in same direction

62.

Application of the force on current carrying conductor in a magnetic field

a)

Moving coil ammeter

b)

dynamo

c)

Dc motor

d)

electrIc bell

e)

Dc generator

63.

Which electromagnet is the strongest?

a)
b)
c)
d)
64.

Which of the following shows the correct magnetic field pattern?

a)
b)
c)
d)
65.

Which of the following represent the

output voltage of an a.c generator?

a)
b)
c)
d)
66.

An electromagnet is used in these apparatus except

a)

a compass

b)

circuit breaker

c)

telephone earpiece

d)

relays

e)

electric bell

67.

A magnetic field is produced by the current in a long straight wire. The strength of the magnetic

field increases if

a)

The magnitude of the current increases

b)

The distance from the wire increases

c)

The length of the wire increases

68.

The diagram shows that __________.

a)

like currents attract

b)

like currents repel

c)

unlike currents attract

d)

unlike currents repel

69.

The purpose of _____ in a d.c. motor is to reverse the current direction at every half a revolution.

a)

carbon brushes

b)

a commutator

c)

a rectangular coil

d)

a rheostat

70.

When connected to a current flowing from A to B to C to D, ABCD will _____.

a)

rotate clockwise

b)

rotate anticlockwise

c)

move up

d)

move down

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