Magnets Flashcards
1
Q
What are the only four magnetic materials?
A
Iron, steel, nickel and cobalt are the only magnetic materials
2
Q
What direction do magnetic field lines travel?
A
Magnetic field lines travel North to South
3
Q
What do magnetics attract?
A
Magnets attract ferromagnetic metals
4
Q
What is a permanent magnet?
A
A permanent magnet is an object made from a material that is magnetised and creates its own persistent magnetic field
5
Q
What is an electromagnet?
A
Electromagnets are a soft metal made into a magnet by the passage of an electrical current through a coil surrounding it
6
Q
How do you make a temporary magnet?
A
Stroke a piece of iron or steel such as a needle along a permanent magnet
7
Q
Name three things that effect the strength of an electromagnet
A
- Number of coils
- Size of current
- Material of core
