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P H Y S I C S 2 > November Test - Magnetism > Flashcards

November Test - Magnetism Flashcards

1
Q

What is a soft magnet?

A

Magnetic materials that can easily be magnetised and demagnetised.

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2
Q

What is an example of a soft magnet?

A

Iron, iron-silicon alloys, nickel-iron alloys

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3
Q

What is hard magnet?

A

A magnetic material that retains its magnetism after being magnetised

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4
Q

What is an example of a hard magnet?

A

Cobalt , steel

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5
Q

What is the domain theory?

A

A domain is a group of atoms with magnetic poles. Magnets are made up of tiny magnets, each group of magnetic atoms have a north and South Pole. Before the atoms have been magnetised the poles are random but when you magnetised them they all point in the same direction, even when you cut them in half.

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6
Q

How can you make a magnet manually?

A

Stroking a length of steel with a bar magnet will permanently magnetised the steel

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7
Q

There are - inside a magnet?

A

Poles

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8
Q

What are on either end of a bad magnet?

A

A north and south pole

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9
Q

What are the strongest points of a magnet?

A

The poles

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10
Q

What are the three magnetic materials?

A

Iron colbat and nickel

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11
Q

You can only make a magnet from what?

A

A magnetic material

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12
Q

What are the two ways of magnetising a magnetic material?

A

Manually (stroking a length of steel with a magnet) or electromagnetism (with electricity)

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13
Q

What can you use to test the poles on the magnet?

A

A compas

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14
Q

What are induced poles?

A

Temporary poles

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15
Q

Can an unmagnetised magnetic material repel another magnet or compas?

A

No

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16
Q

-has electricity in it

A

Everything

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17
Q

What is it called when you make a magnetic material a magnet?

A

Magnetising

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18
Q

What is the direction of force?

A

The field lines direction

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19
Q

Where does a compas point to?

A

North

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20
Q

What is true north.

A

The geographical north that is slightly off magnetic north. It’s basically the earths axis

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21
Q

What is magnetic north

A

Where the compass points, it’s actually south but we call it magnetic north

22
Q

How many poles are on a magnet?

A

2, north and south

23
Q

What is a magnetic field?

A

The space around the magnet where forces are felt

24
Q

How can a magnetic field help?

A

A magnet field diagram gives information about the size and direction of the magnetic force

25
Q

Field lines start and end …

A

On the magnet

26
Q

Field lines do not … each other

A

Touch

27
Q

Field lines do not …

A

Cross over

28
Q

The closer the field lines…

A

The stronger the force (closest at the poles)

29
Q

The arrows give the…

A

Direction of force (north to south

30
Q

Compasses point to the … on a bar magnet

A

South

31
Q

If there are two magnets next to each other in a magnetic field how can we determine the poles?

A

Attracting, n+s

Repelling, s+s, n+n

32
Q

Can you sell if the poles are n+n or s+s or n+s by the field lines?

A

Yes and no, you can tell if they are the same Pole (n+n or s+s) or if they are opposite poles (n+s, s+n) but you can’t tell which Pole is which.

33
Q

True Pole is …

A

The earths axis

34
Q

The magnetic pole …

A

Goes down the center of the earth.

35
Q

Where is the earths magnet?

A

The earths core

36
Q

What is the earths core made out of?

A

Malted iron

37
Q

The poles switch every:

A

780000 years

38
Q

If you put a magnet on a desk why won’t it point north?

A

Because friction prevents it from moving so you need to put it on two watch glasses

39
Q

What is a compass

A

A device that determines magnetic north

Basically a bar magnet that is free to spin so it lines up with magnetic field lines.

40
Q

What metals are not magnetic?

A

Copper and aluminium

41
Q

If you put two norths poles of a magnet next to each other the magnets will…

A

Repel

42
Q

If you put two south poles of a magnet next to each other the magnets will…

A

Repel

43
Q

If you put one South Pole and one North Pole next to each other they will…

A

Attract

44
Q

What are the types of poles?

A

North and south

45
Q

Where is the magnet strongest

A

At the poles

46
Q

What are the laws of magnetism

A

Magnets can exert forces on other magnets, magnets can exert forces on unmagnetised magnetic materials

47
Q

Like poles…

A

Repel

48
Q

Opposite poles…

A

Attract

49
Q

Both poles will always … to unmagnetised magnetic materials

A

Attract

50
Q

Are there poles inside a magnet?

A

Yes

P H Y S I C S 2 (2 decks)

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