A student has a strongly magnetised steel bar and wishes to demagnetise it. Which of the following procedures would successfully demagnetise the steel bar?
Cooling the bar in a freezer for several hours
Heating the bar to a high temperature and letting it cool while aligned in an east-west direction
Stroking the bar in one direction using the north pole of another magnet
Placing the bar inside a solenoid connected to a direct current (d.c.) 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.