An electromagnet requires a core that magnetizes easily when the current is turned on, but demagnetizes quickly when the current is turned off. Conversely, a permanent magnet needs to maintain its magnetism.
Which row correctly identifies the materials most suitable for making an electromagnet core and a permanent magnet?
| Electromagnet core | Permanent magnet | |
|---|---|---|
| A | iron | iron |
| B | iron | steel |
| C | steel | iron |
| D | steel | steel |
Row A
Row B
Row C
Row D
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.