A permanent magnet is placed close to one side of an unmagnetised iron disc. The other side of the disc can then pick up a small unmagnetised steel ball, even though the permanent magnet is too far from the ball to lift it directly. The permanent magnet is then taken far away from both objects.
Explain why the disc attracts the steel ball at first and predict how the magnetic behaviour of the disc changes when the permanent magnet is taken away.
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.