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Year 8 Science > 8E Electromagnets > Flashcards

8E Electromagnets Flashcards

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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
Q

What is electromagnetism?

A

How a magnetic field is created by the flow of a current

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26
Q

What happens when a current passes through a wire?

A

A magnetic field surrounds the wire

27
Q

If the current flows up which direction is the magnetic field?

A

Anticlockwise

28
Q

If the current flows down which direction is the magnetic field?

A

Clockwise

29
Q

What does a motor do?

A

Converts electrical energy into movement

30
Q

What happens when a current moves through a magnetic field?

A

A force occurs

31
Q

What is induction?

A

Induction is when movement is used to create electricity

32
Q

What is a generator?

A

When mechanical energy is converted into electrical energy

33
Q

What happens when you turn an electromagnet on?

A

A magnetic field is created

34
Q

Why would a permanent magnet be a problem in a scrap yard?

A

Would not be able to release the objects

35
Q

What is an advantage of using an electromagnet?

A

Can be turned on and off

36
Q

What is meant by segregating?

A

To separate materials

37
Q

Why can only ferromagnetic materials be removed using a magnet?

A

Because only they are attracted to a magnet

38
Q

Why does the clapper become magnetic?

A

Because the circuit become complete

39
Q

What must happen for the bell to continuously ring?

A

The circuit breaks and reconnects

40
Q

Why might some cars not be picked up?

A

Not all cars are ferromagnetic. Some are fibreglass

41
Q

What is the independent variable in the experiment?

A

Number of turns/coils in the wire

42
Q

Identify the equipment required in the experiment.

A

Wire, iron nail, wire and crocodile clips, paper clips, Power supply,

43
Q

What is the dependent variable in the experiment?

A

Number of paper clips picked up

44
Q

Name 2 control variables in the experiment.

A

Voltage and type of core

45
Q

Why should you disconnect the circuit when you are not using it?

A

Batteries will drain, wire might get hot

46
Q

How can you turn the electromagnet off and on?

A

Using a switch

47
Q

How can you tell if the electromagnet is working?

A

If it picks up magnetic materials

48
Q

Why should you calculate the mean number of paper clips?

A

To check for anomalies

49
Q

What are the 3 main stages in scientific investigations?

A

Planning, collecting results, analysing

50
Q

What is a prediction?

A

Using our understanding to guess what might happen

51
Q

What is a variable?

A

A factor that can be changed or measured in an investigation

52
Q

Which variable is measured?

A

The dependent variable

53
Q

What is the name of a variable that is kept the same?

A

Control variable

54
Q

Define the term independent variable.

A

The variable that you change

55
Q

What information is included in the method?

A

Apparatus, Measurements, readings that we will take, safety issues/ risk assessment

56
Q

Why should you disconnect the circuit when you are not using it?

A

Batteries will drain, wire might get hot

57
Q

How can you turn the electromagnet off and on?

A

Using a switch

58
Q

How can you tell if the electromagnet is working?

A

If it picks up magnetic materials

59
Q

Why do we draw a graph of experimental results?

A

To look for a pattern

60
Q

Why is drawing a line of best fit important?

A

Check for anomalies

61
Q

Where do we plot the independent variable on a graph?

A

X axis

62
Q

Where do we plot the dependent variable on a graph?

A

Y axis

63
Q

How do you draw a line of best fit?

A

Usually with a ruler or a curve

Year 8 Science (10 decks)

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