A cupboard door is held closed by a magnet fixed to the door frame. In design A, a plate of iron is fixed to the door. In design B, a plate that has been made into a permanent magnet is fixed to the door.
Explain why design A holds the door closed whichever way round the iron plate is fitted.
Suggest one disadvantage of design B.
In design A, the door is pulled open. Explain why the iron plate no longer behaves as a magnet.
40 exam-style questions on AQA GCSE Physics 7.1 Permanent and induced magnetism, magnetic forces and fields, covering 7.1.1 Poles of a magnet and 7.1.2 Magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.