A student is building a permanent bar magnet and an electromagnet. They must choose suitable materials for the permanent magnet and the core of the electromagnet.
Which row in the table below correctly identifies the materials and the correct reason for the choice of the electromagnet core?
| Permanent magnet | Core of electromagnet | Reason for electromagnet core choice | |
|---|---|---|---|
| A | Steel | Iron | Iron easily loses its magnetism when the current is turned off |
| B | Iron | Steel | Steel retains its magnetism when the current is turned off |
| C | Steel | Copper | Copper is an excellent electrical conductor |
| D | Iron | Copper | Copper strengthens the magnetic field of the coil |
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.