A student investigates different materials for the core of an electromagnet. For each material, she turns the d.c. power supply on and counts how many iron safety pins the electromagnet attracts. She then switches the power supply off and counts how many pins remain attracted to the bottom of the core.
The results of her investigation are shown in the table below:
| Core | Pins attracted with power supply ON | Pins attracted with power supply OFF |
|---|---|---|
| A | 15 | 11 |
| B | 0 | 0 |
| C | 14 | 0 |
| D | 3 | 9 |
Which core is made of a soft magnetic material, such as soft iron?
Core A
Core B
Core C
Core 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.