Chapter - 16 ( Magnetism) Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are the ends of a magnet called?

A

Poles

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

What are the end poles called?

A
  • South Pole
  • North Pole
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When do magnets experience attraction?

A

Unlike poles

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

When do magnets experience repulsion?

A

Like poles

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

What are properties that magnetic materials have?

A
  • Experience a force when placed in magnetic field
  • are attracted to magnet when unmagnetised
  • can be magnetised to form
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Do non magnetic materials experience a force when placed in magnetic material?

A

No

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

What are permanent magnets made out of?

A

Steel (Not always)

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

Why is steel called permanent magnet?

A

Tend to stay magnetised

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

What are the uses of permanent magnets?

A
  • Compasses
  • School lab experiments
  • Toys
  • Fridge magnets
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the use of electromagnets?

A
  • Use electricity to create a magnet from a current - carrying wire
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are the advantages of electromagnets?

A
  • They can be magnetised and demagnetised at the flick of a switch
  • they can be switched on and off
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the uses of electromagnets?

A
  • MRI scans
  • Speakers and earphones
  • Recycling
  • Mag lev trains
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the elements that are magnetic?

A
  • Iron
  • Cobalt
  • nickel
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why is stell also a magnet?

A

It is an alloy that contains iron

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

What should we observe when a magnet Is brought closest to a known magnet.

A
  • If it is repelled by known magnet then material is a magnet
  • if it can only be attracted and not repelled, then it is not a magnet
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What’s re the 2 types of magnets?

A
  • Permanent magnets
  • Induced magnets
17
Q

Wha are the properties of permanent magnets?

A
  • Made of steel
  • Produce its own magnetic field
  • does not lose magnetism
18
Q

What’s re the properties of induced magnets?

A
  • temporarily magnet
  • induced magnetism
  • one end becomes north and the other South

-

19
Q

What happens when magnetism is induced on a material?

A
  • one end of material becomes north pole
  • other end will become South pole
20
Q

Why are magnetic materials attracted to permanent magnets?

A

End of a material closest to the magnetic will have the opposite poles to magnet pole closest to the material

21
Q

What happens when magnetic material is moved away from their permanent magnet?

A

Loses all it’s magnetic properties

22
Q

Define magnetic field.

A

The region around a magnet where a force acts on another magnet or on a magnetic material (such as iron, steel, cobalt and nickel)

23
Q

What are all magnets surrounded by?

A

Magnetic field

24
Q

When is a uniform field created?

A

When two opp poles are held together and magnetic fields always move from north to south

25
Q

what does a uniform magnetic field always have?

A

Same strength and direction at all points

26
Q

What do the magnetic field lines represent?

A
  • Strength
  • Direction
    Of magnetic field
27
Q

What shows the direction of the magnetic field?

A

arrows

28
Q

What are 2 important rules to remember when drawing magnetic field lines?

A
  • always go from north to south
  • must never touch or cross each other
29
Q

Where is the magnetic field in a bar magnet the strongest?

A

At the poles

30
Q

When does the magnetic field strength in a bar magnet become weaker and why?

A
  • weaker as the distance from the magnet increases
  • lines are further apart
31
Q

How is the strength of magnetic field shown?

A
  • Spacing of lines

Close: String magnetic field

Far: weak magnetic field