Which of the following procedures can be used to demagnetise a magnetised steel rod?
Cooling the rod in a freezer to a temperature below 0∘C0^\circ\text{C}0∘C
Stroking the rod repeatedly in one direction using the south pole of a bar magnet
Heating the rod to a high temperature and allowing it to cool while aligned in an East-West direction
Connecting the rod to a high-voltage direct current (d.c.) power supply
169 exam-style questions on CIE IGCSE Physics Simple phenomena of magnetism, covering Simple phenomena of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.