Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Electromagnets > Electromagnets > Flashcards

Electromagnets Flashcards

1
Q

True or false? Electrostatics can be useful for crop spraying in farming.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Electric field lines go from…

A

Positive to Negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Will there be a force on a current-carrying wire in a magnetic field if the current and fields are parallel?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What units are used to measure resistance? Give the full name, not the symbol

A

ohms or ohm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What shape will the magnetic field around a straight wire carrying an electric current be?

A

Circular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

True or false? A piece of steel is permanently magnetised when placed near a magnet.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Permanent Magnet

A

An object which always has its own magnetic

field. It cannot be switched on or off.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Electromagnet

A

A temporary magnet produced using an electric field.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Magnetise

A

Turn an object into a magnet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Magnetic Field Lines

A

Imaginary lines that show the direction of the

force on a magnetic material.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Magnetic Material

A

A material that is attracted to a magnet, such

as, iron, steel, nickel, or cobalt.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Magnet

A

A magnet has a north and a south pole and

generates it’s own magnetic field.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What name is given to a magnet produced by an electric current?

A

Electromagnet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

If a wire carrying an electric current is placed in a magnetic field, a force is produced. What name is given to this effect?

A

motor effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

True or false? A cable that connects an electrical appliance to the mains will have a magnetic field around it when the appliance is being used.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The diagram shows a wire carrying an electric current. This wire is made from copper, which is not a magnetic material. Will the wire still move?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The equipment shown below can be used to demonstrate the motor effect. Name the piece of equipment labelled in the diagram that will move to show the motor effect.

A

Rod

18
Q

True or false? Electromagnets are a type of permanent magnet.

A

False

19
Q

What effect would increasing the strength of the magnetic field have on the force caused by the motor effect?

A

Increase

20
Q

An advantage of electromagnets over bar magnets is that you can easily vary the __________ of the magnetic field. What word completes this sentence?

A

Strength

21
Q

True or false? Electricity is useful because it enables energy to be easily transmitted over long distances.

A

True

22
Q

name the component used in electric circuits that is sensitive to temperature

A

thermisistor

23
Q

Name the component used in electric circuits that is sensitive to light. Give the full name, not the abbreviation

A

light dependant resistor

24
Q

An object that gains electrons becomes… what?

A

negatively charged

25
Q

In a circuit with two identical components connected in parallel, the current which flows through its different branches will be __________. Which of the following completes the sentence?

A

the same

26
Q

Electric motors transfer energy to the load as useful work and waste energy in the __________ energy stores of the surroundings. What one word completes the sentence?

A

Thermal

27
Q

The symbol below represents a __________ __________ in a circuit. What TWO words complete the sentence?

A

closed switch

28
Q

True or false? Metals do not become charged because charges move easily through them rather than becoming stuck in one place.

A

True

29
Q

A current-carrying wire will have a __________ field around it. What is the missing word?

A

Magnetic

30
Q

A copper wire is held between two magnets as shown below. Will there be a potential difference across the ends of the wire if it is moved vertically upwards?

A

Yes

31
Q

The motor effect happens because the current-carrying wire produces a __________ __________ that interacts with the field of the magnet. What two words complete this sentence?

A

Magnetic Field

32
Q

The diagram shows a simplified version of a generator. What type of current will it generate?

A

alternating

33
Q

True or false? Electromagnets are a type of permanent magnet.

A

False

34
Q

True or false? A current-carrying straight wire placed in a magnetic field can move because it experiences a force.

A

True

35
Q

When a piece of iron is placed next to a magnet it also becomes magnetised. This type of magnetism is called __________ magnetism. What word completes the sentence?

A

Induced

36
Q

ferrous

A

containing iron

37
Q

Is steel a ferrous metal?

A

yes

38
Q

Maxine and Jerry are in a science lab trying to make a magnet. Maxine suggests stroking a piece of steel with a bar magnet in one direction. Jerry thinks it is better to stroke the piece of steel in both directions with the bar magnet. Who is correct?

A

Maxine

39
Q

What can be used to plot the magnetic field around a bar magnet?

A

compass

40
Q

What name is given to the amount of work done in a given time?

A

Electromagnets (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions