A permanent steel magnet is placed inside a solenoid to be demagnetised. Which type of current must be passed through the solenoid, and how should the magnet be moved to successfully achieve demagnetisation?
A direct current is passed, and the magnet is withdrawn quickly from the solenoid.
A direct current is passed, and the magnet is withdrawn slowly from the solenoid.
An alternating current is passed, and the magnet is withdrawn quickly from the solenoid.
An alternating current is passed, and the magnet is withdrawn slowly from the solenoid.
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.