A sealed plastic game counter contains either a small permanent magnet or an unmagnetised iron disc. The object inside is fixed so that it cannot turn, but the counter is free to slide. When the north pole of a bar magnet is brought close to the counter, the counter moves away from the bar magnet.
Which statement is correct?
The object inside must be the unmagnetised iron disc.
The result cannot distinguish between the two possible objects.
The movement cannot have been caused by the bar magnet.
The object inside must be the permanent magnet.
80 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.