Electromagnets Revision Flashcards
1
Q
What are the three magnetic metals
A
Iron
Nickel
Cobalt
2
Q
When magnetised what happens with domains in a magnetic metal
A
They straighten and point towards where the magnet is
3
Q
Which repel and which attract N N NS SS SN
A
Repel
Attract
Repel
Attract
4
Q
What causes the earths magnetic field
A
The earths iron core
5
Q
Is a compass a permanent magnet or an electromagnet
A
A permanent magnet
6
Q
Can an electromagnet be switched on and off
A
Yes
7
Q
What does an electromagnet have in common with a permanent magnet?
A
The both have a magnetic field pattern
8
Q
Where can an electromagnet be used
A
In a scrap yard, a doorbell and a relay
9
Q
What happens when you increase the number of coils of wire around an electromagnet
A
The electromagnets magnetic field becomes stronger and attracts more magnetic materials
