Magnets And Electromagnets Flashcards
1
Q
Name 3 magnetic metals
A
- Iron
- Steel
- Nickel
- Cobalt
2
Q
What do magnetically soft materials do?
A
Gain and lose magnetism quickly
3
Q
Name an example of a magnetically soft material
A
Iron
4
Q
What do magnetically hard materials do?
A
Stay magnetised for longer
5
Q
Name a magnetically hard material
A
Steel
6
Q
Name 3 ways of making a magnet
A
- Stroke it with another magnet
- Leave it next to another magnet
- Wrap it in a coil of wire with a current flowing through it
- Hammer is in a magnetic field
7
Q
How do you break a magnet?
A
- Hearing it up
- Dropping it
- Flowing an alternating current through it
10
Q
What happens to the domains when a material is magnetised?
A
They align
11
Q
What are the positives of an electromagnet?
A
It can be- Very strong
- Their strengths can be changed
- they can be switched on and off
12
Q
How do you make an electromagnet stronger?
A
- A higher current
- More could of wire
- Add an iron core
13
Q
What are domains?
A
Tiny magnetised areas
16
Q
What is a solenoid?
A
The current flowing through a cool of wire
17
Q
What switches every few hundred years?
A
The earths magnetic field
