An electromagnet is used in a scrapyard to lift magnetic materials and then drop them when the electric current is switched off. Why is soft iron preferred over steel as the core of this electromagnet?
Soft iron loses its magnetism easily when the current is switched off.
Soft iron forms a permanent magnet.
Soft iron is much less dense than steel.
Soft iron is an electrical insulator.
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.