F - Magnetism - Paper 2 Flashcards
What is meant by the term “magnetic material”?
A material that is attracted by a magnet. Can become magnetised when placed in a magnetic field.
What is a magnetically hard material?
A material that stays magnetic after it has been magnetised.
What is a name for a magnetically hard material that has been magnetised?
A permanent magnet
What is a magnetically soft material?
A material that does not stay magnetic once it has been magnetized.
What is a use for a soft magnet?
Used in electromagnets - as they can be switched on and off
Describe a method of inducing a magnet in a bar of iron
take a bar of iron (of the hard magnetic type) and stroke it repeatedly in the same direction with a magnet.This will induce a magnetic field in the magnet.
Describe another method of inducing a magnet in a bar of iron
place the iron bar inside a coil of wire carrying a current.Again this will induce a field in the bar.
The head of an iron nail is placed close to the north pole of a bar magnet. The head of the nail is attracted toward the bar magnet until they tuch an it sticks to the magnet. Explain what causes this to happen.
The magnet induces magnetism in the nail and it becomes magnetised.
Is iron a magnetic material
yes
Is cobalt a magnetic material
yes
Is nickel a magentic material
yes
Is copper a magnetic material
no
