A position sensor detects the magnetic field produced by a marker inside a machine. The marker must remain strongly magnetic for at least six hours after installation, when it is far from any other magnet.
A prototype marker is made from iron. Before installation, the marker is placed in the magnetic field of a permanent magnet and becomes magnetic. The marker is then removed from the field and installed in the machine.
Describe and explain whether the prototype marker will meet the design requirement.
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.