A small unmagnetised cobalt bead hangs freely from a thread. Cobalt is a magnetic material. A permanent magnet is held a short distance to the right of the bead, without touching it, with its north pole facing the bead. The magnet is then turned end-for-end in the same position so that its south pole faces the bead.
Which statement describes the magnetic force on the bead?
The force remains directed towards the magnet in both orientations.
The force is towards the magnet at first but becomes zero when it is turned.
The force is zero at first but is towards the magnet when it is turned.
The force is towards the magnet at first but reverses when it is turned.
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.