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Year 8 Topics > 8E Electromagnets > Flashcards

8E Electromagnets Flashcards

1
Q

What is the area of magnetism around a magnet called?

A

A magnetic field

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2
Q

What is the strongest type of magnet?

A

Neodymium

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3
Q

What is the most common material to make a magnet from?

A

Iron

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4
Q

What is the term for being able to hold an alignment of atoms?

A

Hysteresis

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5
Q

What is a magnetic moment?

A

When atoms have a tiny magnetic field

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6
Q

How can you weaken magnetism?

A

Dropping, heating or hammering them

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7
Q

What is a coil of wire called?

A

A solenoid

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8
Q

How is an electromagnet different to other magnets?

A

Not permanent. It can be turned on and off.

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9
Q

What is a magnetic field?

A

Area where an object has a magnetic influence

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10
Q

Which 2 Scientists made discoveries about magnetism?

A

Faraday and Maxwell

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11
Q

What can affect magnetic strength?

A

The material an object is made of

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12
Q

Where do the magnetic field lines begin and end?

A

At the poles

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13
Q

Why do we have North and South Poles on the Earth?

A

It is the place where the planet’s magnetic field lines come together

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14
Q

What is a moving charge called?

A

Current

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15
Q

What happens to objects that attract?

A

Move towards each other

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16
Q

What happens to objects that repel?

A

Move away from each other

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17
Q

How can we detect earth’s magnetic field?

A

Using a magnetic compass

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18
Q

What does dipole mean?

A

It has two poles (north and south)

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19
Q

What is a magnetic reversal?

A

When the poles switch

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20
Q

How do we know about reversals?

A

In the geological record at mid ocean ridges

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21
Q

What equipment is used to detect reversals?

A

A magnetometer

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22
Q

Where is the youngest oceanic crust found?

A

Closest to the Mid ocean ridge

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23
Q

What happens in a magnetic anomaly?

A

The poles weaken in strength and the direction changes

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24
Q

What happens to rocks because of the earth’s magnetic field?

A

The magnetic minerals orientate depending on the direction of the magnetic field

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25
What is electromagnetism?
How a magnetic field is created by the flow of a current
26
What happens when a current passes through a wire?
A magnetic field surrounds the wire
27
If the current flows up which direction is the magnetic field?
Anticlockwise
28
If the current flows down which direction is the magnetic field?
Clockwise
29
What does a motor do?
Converts electrical energy into movement
30
What happens when a current moves through a magnetic field?
A force occurs
31
What is induction?
Induction is when movement is used to create electricity
32
What is a generator?
When mechanical energy is converted into electrical energy
33
What happens when you turn an electromagnet on?
A magnetic field is created
34
Why would a permanent magnet be a problem in a scrap yard?
Would not be able to release the objects
35
What is an advantage of using an electromagnet?
Can be turned on and off
36
What is meant by segregating?
To separate materials
37
Why can only ferromagnetic materials be removed using a magnet?
Because only they are attracted to a magnet
38
Why does the clapper become magnetic?
Because the circuit become complete
39
What must happen for the bell to continuously ring?
The circuit breaks and reconnects
40
Why might some cars not be picked up?
Not all cars are ferromagnetic. Some are fibreglass
41
What is the independent variable in the experiment?
Number of turns/coils in the wire
42
Identify the equipment required in the experiment.
Wire, iron nail, wire and crocodile clips, paper clips, Power supply,
43
What is the dependent variable in the experiment?
Number of paper clips picked up
44
Name 2 control variables in the experiment.
Voltage and type of core
45
Why should you disconnect the circuit when you are not using it?
Batteries will drain, wire might get hot
46
How can you turn the electromagnet off and on?
Using a switch
47
How can you tell if the electromagnet is working?
If it picks up magnetic materials
48
Why should you calculate the mean number of paper clips?
To check for anomalies
49
What are the 3 main stages in scientific investigations?
Planning, collecting results, analysing
50
What is a prediction?
Using our understanding to guess what might happen
51
What is a variable?
A factor that can be changed or measured in an investigation
52
Which variable is measured?
The dependent variable
53
What is the name of a variable that is kept the same?
Control variable
54
Define the term independent variable.
The variable that you change
55
What information is included in the method?
Apparatus, Measurements, readings that we will take, safety issues/ risk assessment
56
Why should you disconnect the circuit when you are not using it?
Batteries will drain, wire might get hot
57
How can you turn the electromagnet off and on?
Using a switch
58
How can you tell if the electromagnet is working?
If it picks up magnetic materials
59
Why do we draw a graph of experimental results?
To look for a pattern
60
Why is drawing a line of best fit important?
Check for anomalies
61
Where do we plot the independent variable on a graph?
X axis
62
Where do we plot the dependent variable on a graph?
Y axis
63
How do you draw a line of best fit?
Usually with a ruler or a curve

Year 8 Topics (10 decks)

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