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Physics Paper 2 > Topic 7 Magnetism And Electromagnetism > Flashcards

Topic 7 Magnetism And Electromagnetism Flashcards

1
Q

What do all magnets have?

A

North (north seeking) pole
South (south seeking) pole

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2
Q

What do all magnets produce?

A

Magnetic field

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3
Q

What is a magnetic field?

A

Region around magnet where force acts on another magnet or magnetic material

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4
Q

What are 4 magnetic materials?

A

Iron
Steel
Cobalt
Nickel

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5
Q

What type of force are attraction and repulsion between magnetic poles?

A

Non contact

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6
Q

What are the 2 types of magnet?

A

Permanent
Induced

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7
Q

What does a permanent magnet produce its own?

A

Magnetic field

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8
Q

What is an induced magnet?

A

Material become magnet when placed in magnetic field

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9
Q

What is the force always between permanent and induced magnets?

A

Attraction

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10
Q

What happens to an induced magnet when it’s removed from the magnetic field?

A

Quickly loses magnetism

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11
Q

What is the force always between a magnet and a magnetic material?

A

Attractive

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12
Q

Where on a magnet are the magnetic forces strongest?

A

Poles

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13
Q

Where on a magnet is the magnetic field strongest?

A

Poles

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14
Q

What happens when 2 magnets are bought close together?

A

Exert a force on each other

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15
Q

Where does the direction of a magnetic field line go from?

A

North Pole to South Pole

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16
Q

What is the direction of the magnetic field at any point given by?

A

Direction of force that would act on another North Pole placed at that point

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17
Q

What happens the closer you get to a magnet?

A

Field is stronger

18
Q

What do closer together magnetic field lines indicate?

A

Stronger field

19
Q

What does a magnetic compass contain?

A

Tiny bar magnet

20
Q

Why does a compass point in the direction of the magnetic field it is in?

A

North Pole of its magnet attracted to South Pole of any magnet its near

21
Q

Why do compasses always point north when they’re not near a magnet?

A

Earth generates own magnetic field, shows core of earth must be magnetic

22
Q

What is produced when a current flows through a wire?

A

Magnetic field around wire

23
Q

What 2 things does the strength of the magnetic field produced around a wire depend on?

A

Current through wire
Distance from wire

24
Q

What is the shape of a magnetic field around a wire?

A

Concentric circles

25
Q

What rule can be used to work out the direction of current and direction of magnetic field around a wire?

A

Right hand thumb rule (direction of curled fingers = direction of field)

26
Q

What is a solenoid?

A

Coil of wire

27
Q

How can you increase the strength of the magnetic field created by current through a wire?

A

Shape wire into solenoid

28
Q

Why does wrapping wire into a coil (a solenoid) increase the strength of its magnetic field?

A

Field lines around each loop of wire line up, lots of field lines pointing in same direction and very close together

29
Q

What are 2 words to describe the magnetic field inside a solenoid?

A

Strong and uniform

30
Q

What does the magnetic field around a solenoid have a similar shape to?

A

Bar magnet

31
Q

How can you increase the field strength of a solenoid?

A

Add iron core

32
Q

What does an iron core in a solenoid become whenever current is flowing?

A

Induced magnet

33
Q

What is an electromagnet?

A

Solenoid with an iron core (magnet whose magnetic field can be turned on and off with current)

34
Q

What 3 things does the force acting on a conductor in a magnetic field depend on?

A

Magnetic flux density (how many field lines in region)
Size of current
Length of conductor

35
Q

For a conductor at 90 degrees to a magnetic field and carrying a current, what is the equation to find the force acting on it?

A

Force = magnetic flux density x current x length

36
Q

What is the motor effect?

A

When conductor carrying current is placed in magnetic field, magnet producing the field and conductor exert a force on each other

37
Q

In the motor effect, what does the wire have to be at to experience the full force?

A

90 degrees to magnetic field

38
Q

What 2 things does the force always act at right angles to in the motor effect?

A

Magnetic field of magnets
Direction of current in wire

39
Q

What rule can you use to find the direction of the force in the motor effect?

A

Flemings left hand rule

40
Q

What does your First finger show in Flemings left hand rule?

A

Direction of field

41
Q

What does your seCond finger in Flemings left hand rule show?

A

Direction of current

42
Q

What does your thuMb show in Flemings left hand rule?

A

Direction of force

Physics Paper 2 (4 decks)

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