A crane in a salvage yard needs to pick up scrap steel, move it, and then release it in a designated area.
Which type of magnet is required for this crane, and why?
An electromagnet, because its magnetic field can be easily switched on and off by controlling the electric current.
A permanent magnet, because it provides a consistent, unvarying magnetic force without wasting electrical energy.
An electromagnet, because it remains permanently magnetized even after the power supply is disconnected.
A permanent magnet, because its magnetic field strength can be adjusted by changing the temperature.
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.