Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics - Paper 1 > P4.1 > Flashcards

P4.1 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Two types of forces

A

Contact or non-contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a magnet

A

A magnet is any object that has magnetic field around it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The Closer the field lines…

A

The stronger the magnet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a permanent magnet

A

A permanent magnet is one which always has amagnetic field around it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What happens when a non magnet is brought close to a magnet

A

The non-magnets have magnetism induced in them when the permanent magnet is brought close.i.e. a non magnetic material can sometimes be temporarily made magnetic, and thus will attract (repel) other permanent magnets.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Direction of magnetic field lines

A

Magnetic field lines go from the North pole to the South pole of a magnet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

do field lines cross

A

NO NEVER THATS WRONG OMG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is a magnetic field

A

A region of space within which magnets and magnetic materials experience a magnetic force of attraction or repulsion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens when current flows in a wire

A

A magnetic field is created around it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What do the magnetic field lines around a current carrying wire look like

A

Like concentric rings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do you work out direction of magnetic field lines

A

Corkscrew rule - RIGHT HAND ONLY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a solenoid

A

A solenoid is a device that acts to increase the strength/size of the magnetic field around a current carrying wire.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Solenoids are used to produced what type of magnet

A

Electromagnet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How is a solenoid made

A

A wire is looped many times around a piece of metal (not a magnet!) that can be magnetised (iron which is magnetic material)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is an electromagnet

A

A magnet which runs on electricity (electric current).

An electromagnet’s magnetic field can be switched on and off, by switching the current on and off.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Factors that effect electromagnets

A
  1. The number of coils in the wire.
  2. The size of the current through the wire.
  3. Changing the material of the core inside the coils.
17
Q

Magnetic metals

A

Iron
Cobalt
Nickel

18
Q

two types of magnets

A

Permanent magnets
Induced magnets

19
Q

Permanent Magnets

A

made out of permanent magnetic materials, for example steel

will produce its own magnetic field

It will not lose its magnetism

20
Q

Examples of permanent magnetic material

A

Steel

21
Q

Induced Magnets

A

When a magnetic material is placed in a magnetic field, the material can temporarily be turned into a magnet

22
Q

Special about induced magnetism

A

Magnetic materials will always be attracted to a permanent magnet - ALWAYS HAVE OPPOSITE POLE to magnets closest pole

23
Q

When the induced magnetic material is removed from the magnetic field…

A

lose most/all of its magnetism quickly

24
Q

Earth

A
25
Q

Factors Affecting Magnetic Field Strength

A

The size of the current

The distance from the long straight conductor (such as a wire)

26
Q

How to find the polarity of each end on the solenoid

A

If the current is travelling around in a clockwise direction then it is the South Pole

If the current is travelling around in an anticlockwise direction then it is the North Pole

27
Q

To increase strength of solenoid - add core of what

A

Iron

28
Q

Why iron

A

The iron core will become an induced magnet when current is flowing through the coils

The magnetic field produced from the solenoid and the iron core will create a much stronger magnet overall

29
Q

What is a soft magnetic material

A

easy to magnetise but also easily lose their magnetisation.

30
Q

Example of a soft magnetic material

A

Iron

31
Q

What is a hard magnetic material

A

difficult to magnetise but once they are magnetised, they are difficult to demagnetise.

32
Q

Example of a hard magnetic material

A

Steel

33
Q

Uses of soft magnetic material

A

Electromagnets - turn on and off quickly (iron core)

34
Q

Uses of soft magnetic material

A

Permanent Magnets

35
Q

What is an electromagnet

A

consists of a long coil or solenoid wound around a core made from a soft magnetic material such as iron.

36
Q

Differences between electromagnet + permanent magnet

A
37
Q

The core of an electromagnet is made from a soft magnetic material. Why would a hard magnetic material be unsuitable for this purpose?

A

Hard magnetic materials are difficult to magnetise so they would not create a strong magnetic field when the current is switched on. Once magnetised, they retain their magnetisation so it would not be possible to switch the electromagnet off.

38
Q

Why is there a limit to how much current you can put through an electromagnet

A

results in a strong heating effect that could melt the insulation - use a superconducting coil (coils of zero resistance)

Physics - Paper 1 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions