Which action will demagnetise a magnetised steel needle?
Place it inside a coil carrying a direct current (d.c.).
Heat it strongly in a flame.
Keep it in a freezer for several days.
Stroke it repeatedly with one pole of a bar magnet in one 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.