Which of the following methods is a correct way to demagnetise a steel bar magnet?
Hammering the magnet repeatedly while it is aligned in an East-West direction.
Placing the magnet inside a solenoid connected to a steady d.c. supply and then switching it off.
Cooling the magnet to very low temperatures in a freezer.
Gently stroking the magnet with one pole of another permanent magnet in a single direction.
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.