magneticism Flashcards
1
Q
Magnets have how many poles
A
north and south
2
Q
Law of magnetism: Opposite poles…
A
attract
3
Q
Law of magnetism: Like poles
A
repel
4
Q
Magnetic materials: Uses and things
A
- Can be soft/hard
- Magnetically soft materials are easy to magnetise
- Easily lose their magnetism.
- Magneticcally hard:
- Difficult to magnetise
- Don’t easily lose their magnetisim.
5
Q
How are permanent magnets made
A
Magnetically hard materials
6
Q
Electromagnets are made
A
out of magnetically soft materials
7
Q
What are magnetic fields
A
- Region around a magnet where force acts on another magnet/ magnetic material
8
Q
Magnetic field lines: what do they represent
A
- Strength and direction of magnetic field
- Direction of magnetic field using arrows
- Strength of magnetic field
9
Q
Strength of field lines
A
- If close together then field will be strong
- if far apart then field will be weak
10
Q
Rules for field lines
A
- Always go from North to south
- Should never touch/ cross other field lines
11
Q
Magnetic field around Bar magnet
A
- Magnetic field is strongest at the poles
- Field lines are closest together
-Field becomes weaker as distance from magnet increases - Magnetic field lines are getting further apart
12
Q
Uniform magnetic meaning
A
- Uniform magnetic field will be produced in the gaps between opposite poles
- Outside gap… field will not be unfiorm.
13
Q
Uniform magnetic field
A
- Has the same strength and direction at all points
- The magnetic field lines are same distance apart between gaps of poles.
14
Q
How can field lines be determined
A
- By plotting compasses pointing from north to south
- Using iron fillings
15
Q
Metals in periodic table that are magnetic
A
- Iron
- Cobalt
- Nickel
