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P4 Flashcards

(85 cards)

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1
Q

What are the ends of a magnet called?

A

The ends of a magnet are called poles.

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2
Q

How many poles do magnets have?

A

Magnets have two poles: a north and a south.

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3
Q

What happens when two magnets are held close together?

A

There will be an attractive or repulsive force between the magnets depending on how they are arranged.

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4
Q

What do opposite poles do?

A

Opposite poles attract.

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5
Q

What do like poles do?

A

Like poles repel.

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6
Q

What does the Law of Magnetism state about like poles?

A

Two like poles repel each other.

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7
Q

What does the Law of Magnetism state about unlike poles?

A

Two unlike poles attract each other.

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8
Q

What type of force is the attraction or repulsion between two magnetic poles?

A

It is an example of a non-contact force.

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9
Q

How can attraction and repulsion be demonstrated?

A

By the magnetic field patterns around bar magnets.

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10
Q

What do the field lines look like for different magnetic poles?

A

The field lines will look slightly different for each.

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11
Q

What pushes the poles together in a strong magnetic field?

A

A strong magnetic field pushes the poles together.

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12
Q

What happens when two bar magnets with opposite poles are near each other?

A

Two attracting bar magnets with opposite poles attract each other.

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13
Q

What do the letters ‘S’ and ‘N’ represent in magnetism?

A

‘S’ represents the South pole and ‘N’ represents the North pole.

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14
Q

What is the behavior of two repelling bar magnets?

A

Two repelling bar magnets with like poles will repel each other.

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15
Q

What is observed in the area between two like poles of bar magnets?

A

There is no magnetic field in the area between two like poles.

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16
Q

What do magnetic field lines indicate for attracting and repelling bar magnets?

A

Magnetic field lines indicate the configuration of the magnetic field around two bar magnets.

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17
Q

What are magnetic materials attracted to?

A

Magnetic materials are attracted to a magnet; non-magnetic materials are not.

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18
Q

Which metals in the Periodic Table are magnetic?

A

Very few metals are magnetic, including Iron, Cobalt, Nickel.

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19
Q

Is steel a magnetic material?

A

Steel is an alloy which contains iron, so it is also magnetic.

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20
Q

How do magnetic materials react to magnets?

A

Magnetic materials will always be attracted to the magnet, regardless of which pole is held close to it.

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21
Q

How can you test if a material is a magnet?

A

To test whether a material is a magnet, it should be brought close to a known magnet.

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22
Q

What indicates that a material is a magnet?

A

If the material can be repelled by the known magnet, then the material itself is a magnet.

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23
Q

What indicates that a material is a magnetic material?

A

If it can only be attracted and not repelled, then it is a magnetic material.

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24
Q

What are the two types of magnets?

A

Permanent magnets and induced magnets

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25
What materials are permanent magnets made from?
Permanent magnetic materials, for example, steel
26
What is a characteristic of permanent magnets?
They produce their own magnetic field and do not lose their magnetism
27
What happens when a magnetic material is placed in a magnetic field?
It can temporarily be turned into a magnet
28
What is the term for the temporary magnetism induced in a material?
Induced magnetism
29
Fill in the blank: Permanent magnets will produce their own _______.
[magnetic field]
30
True or False: Induced magnets maintain their magnetism permanently.
False
31
What is the key difference between permanent magnets and induced magnets?
Permanent magnets retain magnetism, while induced magnets do not
32
What happens to the end of a magnetic material closest to a magnet?
It will have the opposite pole to the magnet's pole closest to the material.
33
What pole does a magnetic material temporarily become when near a north pole?
It temporarily becomes a south pole.
34
What pole does a magnetic material temporarily become when near a south pole?
It temporarily becomes a north pole.
35
What happens to a magnetic material when it is removed from a magnetic field?
It will lose most or all of its magnetism quickly.
36
What surrounds all magnets?
All magnets are surrounded by a magnetic field.
37
How is a magnetic field defined?
The region around a magnet where a force acts on another magnet or on a magnetic material (such as iron, steel, cobalt, and nickel).
38
What are magnetic field lines used for?
Magnetic field lines are used to represent the strength and direction of a magnetic field.
39
How is the direction of the magnetic field shown?
The direction of the magnetic field is shown using arrows.
40
How is the strength of the magnetic field indicated?
The strength of the magnetic field is shown by the spacing of the magnetic field lines.
41
What does it mean if magnetic field lines are close together?
If the magnetic field lines are close together, then the magnetic field will be strong.
42
What does it mean if magnetic field lines are far apart?
If the magnetic field lines are far apart, then the magnetic field will be weak.
43
What are the rules for drawing magnetic field lines?
The direction of the field lines should always go from north to south and must never touch or cross other field lines.
44
Where is the magnetic field strongest around a bar magnet?
The magnetic field is strongest at the poles.
45
What happens to the magnetic field as the distance from the magnet increases?
The magnetic field becomes weaker as the distance from the magnet increases because the magnetic field lines are getting further apart.
46
47
What produces a uniform magnetic field?
A uniform magnetic field is produced in the gaps between opposite poles.
48
Where is the magnetic field not uniform?
Outside the gap between the poles, the magnetic field will not be uniform.
49
What direction does a magnetic field always follow?
A magnetic field is always directed from North to South.
50
What characterizes a uniform magnetic field?
A uniform magnetic field has the same strength and direction at all points.
51
How can you show that the magnetic field has the same strength at all points?
There must be equal spacing between all magnetic field lines.
52
How can you show that the magnetic field is acting in the same direction at all points?
There must be an arrow on each magnetic field line going from the north pole to the south pole.
53
What indicates that the field strength is the same at every point between the poles?
The magnetic field lines are the same distance apart between the gaps of the poles.
54
How can the shape and direction of a magnetic field be investigated?
The shape and direction of a magnetic field may be investigated using plotting compasses.
55
What is a plotting compass?
A plotting compass is like a small bar magnet, with a north and south pole.
56
What is the Earth's magnetic field similar to?
The Earth's magnetic field is similar to that of a bar magnet.
57
Where does the north arrow on a magnetic compass point?
The north arrow on a magnetic compass points towards the geographic North Pole (in the Arctic Ocean).
58
Why does the compass point to the geographic North Pole?
The geographic North Pole is a magnetic south pole, as the magnetic field lines point into the pole.
59
What is attracted to the Earth's magnetic south pole?
The north pole of the magnetic compass is attracted to the Earth's magnetic south pole.
60
What is the nature of the geographic South Pole in terms of magnetism?
The geographic South Pole (in Antarctica) is a magnetic north pole, as the magnetic field lines point out of the pole.
61
What happens when a current flows through a conducting wire?
A magnetic field is produced around the wire.
62
What is a conducting wire?
Any wire that has current flowing through it.
63
How can the shape and direction of the magnetic field be investigated?
Using plotting compasses.
64
What do plotting compasses produce?
A magnetic field line pattern.
65
What shape does the magnetic field around a current-carrying wire take?
The magnetic field is made up of concentric circles.
66
What does a circular field pattern indicate about the magnetic field around a current-carrying wire?
It indicates that the magnetic field has no poles.
67
How does the distance from the wire affect the magnetic field?
As the distance from the wire increases, the circles get further apart, showing that the magnetic field is strongest closest to the wire and gets weaker as the distance increases.
68
What rule can be used to determine the direction of the magnetic field?
The right-hand thumb rule can be used to work out the direction of the magnetic field.
69
What happens if there is no current flowing through a conductor?
There will be no magnetic field.
70
What factors affect the strength of the magnetic field around a wire?
The strength of the magnetic field depends on the size of the current and the distance from the conductor.
71
How does the size of the current affect the magnetic field?
A larger current will produce a larger magnetic field and vice versa.
72
How does distance from the conductor affect the magnetic field strength?
The greater the distance from the conductor, the weaker the magnetic field and vice versa.
73
What happens to magnetic field lines as you move away from a wire?
Magnetic field lines become further apart, indicating the field becomes weaker.
74
What is the relationship between increased current and magnetic field strength?
Increased current results in a stronger magnetic field, with field lines closer together.
75
What is the magnetic field like inside a solenoid?
The magnetic field inside the solenoid is strong and uniform.
76
How does one end of the solenoid behave?
One end of the solenoid behaves like the north pole of a magnet; the other side behaves like the south pole.
77
How can you determine the polarity of each end of the solenoid?
To work out the polarity of each end of the solenoid, it needs to be viewed from the end.
78
What does it mean if the current is travelling around in a clockwise direction?
If the current is travelling around in a clockwise direction, then it is the south pole.
79
What does it mean if the current is travelling around in an anticlockwise direction?
If the current is travelling around in an anticlockwise direction, then it is the north pole.
80
What happens if the current changes direction?
If the current changes direction, then the north and south poles will be reversed.
81
What occurs if there is no current flowing through the wire?
If there is no current flowing through the wire, then there will be no magnetic field produced around or through the solenoid.
82
How can the strength of the magnetic field around a solenoid be increased?
The strength can be increased by: 1. Increasing the size of the current flowing through the wire. 2. Increasing the number of coils. 3. Adding an iron core through the center of the coils.
83
What happens to the iron core when current flows through the coils of a solenoid?
The iron core will become an induced magnet when current is flowing through the coils.
84
What is the effect of combining the magnetic field of a solenoid with an iron core?
The combination will create a much stronger magnet overall.
85
What should you remember for exams regarding solenoids?
Remember the ways that the solenoid arrangement can change to enhance the magnetic field, as this is a common exam question!

Physics (8 decks)

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