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Physics Paper 2 > Magnetism and the Motor effect > Flashcards

Magnetism and the Motor effect Flashcards

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1
Q

What are the Two poles in a magnet?

A

North and South Pole.

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2
Q

What is a Magnetic Field?

A

A region where other magnets or magnetic materials experience a force.

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3
Q

Where do the Magnetic field lines go from?

A

North to South.

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4
Q

The closer together the lines are…

A

The stronger the magnetic field.

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5
Q

The further away from a magnet you get…

A

The weaker the field is.

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6
Q

Where is the magnetic field the strongest?

A

At the poles of a magnet.

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7
Q

Between two magnets, if the poles are the same what will happen?

A

It will repel each other.

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8
Q

What would two unlike poles do?

A

Attract each other.

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9
Q

What does it create by placing the north and south poles of two bar magnets near each other?

A

A uniform field between the two poles.

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10
Q

What is inside a compass?

A

A tiny bar magnet called a needle.

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11
Q

What does a compass needle always do when near a magnet?

A

Line up with the magnetic field it’s in and Point towards the South Pole of a magnet.

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12
Q

What happens when a compass is not near a magnet?

A

Always points towards the Earth’s North Pole. This is because the earth generates its own magnetic field. This shows the inside of the Earth must be magnetic.

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13
Q

What are the 3 main magnetic elements?

A

Iron, Nickel and Cobalt.

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14
Q

What happens when you put a magnetic material near a magnet?

A

It is attracted to that magnet.

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15
Q

The magnetic force between a magnet and a magnetic material is…

A

Always attractive.

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16
Q

What are Permanent Magnets?

A

Produce their own magnetic field all the time.

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17
Q

What are Induced Magnets?

A

Only produce a magnetic field while they’re in another magnetic field. If you put any magnetic material into a magnetic field, it becomes an induced magnet.

18
Q

What does magnetic induction explain?

A

Why the force between a magnet and magnetic material is always attractive.

19
Q

What happens when you take away the magnetic field?

A

Induced magnets return to normal and stop producing a magnetic field.

20
Q

What does how quickly they lose their magnetism depend on?

A

The material they’re made from.

21
Q

What are permanent magnets made from?

A

Magnetically hard materials.

22
Q

Magnetically soft materials lose their magnetism very…

A

Quickly.

23
Q

What happens when current flows through a long, straight conductor?

A

A magnetic field is created around it.

24
Q

What is the field made up of?

A

Concentric circles perpendicular to the wire, with the wire in the centre.

25
Q

What happens when changing the direction of the current?

A

Changes the direction of the magnetic field.

26
Q

What rule is used to work out which way the direction of the magnetic field goes?

A

Right hand thumb rule.

27
Q

The larger the current through the wire, or the closer to the wire you are…

A

The stronger the field is.

28
Q

What is the Motor Effect?

A

A current carrying wire in the presence of a Magnetic Field will experience a force.

29
Q

What has to happen to experience the full force?

A

The wire has to be at 90 degrees to the magnetic field.

30
Q

How do we find the direction of the force?

A

Find the direction of the magnetic field and the direction of the current. By using Fleming’s left hand rule.

31
Q

How do you use Fleming’s left hand rule?

A

Using your left hand, point your First finger in the direction of the magnetic field and your seCond finger in the direction of the Current. Your thumb will then point in the direction of the force.

32
Q

How do we calculate the strength of the force?

A

F = B * I * L

33
Q

What is the Magnetic Flux density?

A

How many field lines there are in a region.

34
Q

What is I in the formula, F = B * I * L

A

Size of the current.

35
Q

What is a Solenoid?

A

A long coil of wire.

36
Q

How can you increase the strength of the magnetic field produced by a length of wire?

A

By wrapping it into a long coil with lots of loops. (Solenoid)

37
Q

What is the field like inside the solenoid?

A

You get lots of field lines pointing in the same direction. The magnetic field is strong and almost uniform.

38
Q

What is the field like outside the solenoid?

A

The overlapping field lines cancel each other out so the field is weak apart from at the ends of the solenoid.

39
Q

The direction of the field depends on…

A

The direction of the current.

40
Q

What is an Electromagnet?

A

A magnet with a magnetic field that can be turned on and off using an electric current.

41
Q

How can you increase the strength of the solenoid even more?

A

By putting a block of iron in the centre of the coil. This iron core becomes an induced magnet whenever current is flowing.

42
Q

What is Electromagnetic induction?

A

The induction of a potential difference in a wire which is experiencing a change in magnetic field.

Physics Paper 2 (1 decks)

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