Magnetism Flashcards
0
Q
Advantages of electromagnets
A
Can change the strength
Can turn them on or off
Don’t break as easily
1
Q
Ferrous metal
A
A metal containing iron and is therefore magnetic
2
Q
Electromagnetic induction
A
When electricity is generated
3
Q
Permanent magnets
A
Made from magnetically hard objects such as steel
A magnetically hard retains its magnetism after it has been magnetised
4
Q
Non permanent magnet
A
Iron is a magnetically soft material that loses its magnetism easily
Used as temporary magnets
5
Q
Magnetic field
A
The area where magnetism can be detected
Flows from north to south
6
Q
The strength of the magnetic field around a current can be altered by…
A
Wrapping the wire into a coil
Increasing the current in the wire
7
Q
Increasing the strength of the field around a solenoid
A
- increase current
- increasing the number of turns
- wrapping the solenoid around a magnetically soft core like iron
