CAMBRIDGE IGCSE™ PHYSICS: CHAPTER 16 WORKSHEET ANSWERS
Worksheet answers – Chapter 16
Worksheet 16A
Question
Answer
1
The nail is unmagnetised, because otherwise one end (of the nail) would repel from one of the poles of the
magnet / the force of attraction would be weaker from one end than the other; the N and S poles of the
magnet have equal strength.
2
induced magnetism
3
B
4a
4b
plotting compass / magnetic compass
5
loses its magnetism easily / easily demagnetised (not stops being magnetic)
Cambridge IGCSE™ Physics – Smyth © Cambridge University Press 2021
1
CAMBRIDGE IGCSE™ PHYSICS: CHAPTER 16 WORKSHEET ANSWERS
Worksheet 16B
Question
Answer
1
Bring each end of the nail up to one pole of the magnet / bring each pole of the magnet up to one end
of the nail.
If there is attraction at one end and repulsion (or less attraction) at the other then the nail is magnetised.
If there is equal attraction at both ends then the nail is unmagnetised.
2a
induced magnetism
2b
north
3
B
4a
4b
where the lines are closer together
4c
plotting compass / magnetic compass
5
The hard material keeps its magnetism, so the permanent magnet last for longer.
The soft material loses its magnetism easily / easily demagnetised (not stops being magnetic) so the
electromagnet can be switched off.
Cambridge IGCSE™ Physics – Smyth © Cambridge University Press 2021
2
CAMBRIDGE IGCSE™ PHYSICS: CHAPTER 16 WORKSHEET ANSWERS
Worksheet 16C
Question
Answer
1
Bring each end of the nail up to one pole of the magnet / bring each pole of the magnet up to one end
of the nail.
If there is attraction at one end and repulsion (or less attraction) at the other then the nail is magnetised.
If there is equal attraction at both ends then the nail is unmagnetised.
2a
induced magnetism
2b
A north pole is induced at the end of both nails.
Like poles repel so the nails are pushed apart.
3
B
4a
4b
where the lines are closer together
4c
plotting compass / magnetic compass
4d
5
The hard material keeps its magnetism so the permanent magnet last for longer.
The soft material loses its magnetism easily / easily demagnetised (not stops being magnetic) so the
electromagnet can be switched off.
Cambridge IGCSE™ Physics – Smyth © Cambridge University Press 2021
3