Summary
Magnets can be made temporarily using two methods: the Stroking Method and the Electrical Method.
- Stroking Method — involves stroking an iron nail with a magnet in one direction repeatedly until it becomes magnetized.
Example: Stroking an iron nail with a bar magnet to make it attract small magnetic items. - Electrical Method — involves coiling a wire around an iron nail and connecting it to a battery to create an electromagnet.
Example: Wrapping a wire around an iron nail and connecting it to a battery to pick up paper clips. - Electromagnet — a type of temporary magnet created using electricity, which loses its magnetism when the electric current is removed.
Example: An electromagnet used in a scrapyard to lift metal objects.
Exam Tips
Key Definitions to Remember
- Stroking Method: Making a magnet by stroking an iron object with a magnet.
- Electrical Method: Making a magnet by coiling wire around an iron object and using electricity.
- Electromagnet: A temporary magnet created using electricity.
Common Confusions
- Thinking that stroking in any direction will magnetize an object.
- Believing an electromagnet remains magnetized without electricity.
Typical Exam Questions
- How do you make a temporary magnet using the stroking method? Stroke an iron nail with a magnet in one direction repeatedly.
- What happens to an electromagnet when the battery is removed? It loses its magnetism and is no longer an electromagnet.
- How can you make an electromagnet stronger? Coil the wire more times or add more batteries.
What Examiners Usually Test
- Steps involved in making a magnet using both methods.
- Differences between a permanent magnet and an electromagnet.