P7: Induced Magnetism Flashcards
1
Q
What materials can pass through magnetic fields?
A
Non-magnetic materials such as:
- Zinc
- Aluminium
- Copper
2
Q
What is induced magnetism?
A
When a magnetic material becomes magnetic after being placed in a magnetic field, and has it’s own North and South poles.
3
Q
What happens to soft iron and hard steel when the magnet is removed?
A
Soft iron loses magnetism, hard steel retains it.
4
Q
Why is steel used for permanent magnets?
A
It retains its magnetism even if the magnet is removed.
5
Q
Why is iron used for electromagnets?
A
It is easily magnetised & demagnetised, so it can be switched off and on in a circuit.
6
Q
What is a permanent magnet?
A
A permanent magnet produces its own magnetic field, and retains its magnetic ability even if there is no inducing field or current.
