Magnetic materials can be used to make permanent magnets or temporary magnets.
The Table shows two uses of magnetic materials.
Table
| Use | Material used | Type of magnet needed |
|---|---|---|
| needle of a compass | steel | |
| core of an electromagnet in a scrapyard crane | iron |
Complete the Table by writing permanent or temporary in each empty box.
Explain why steel is used to make the compass needle.
An unmagnetised iron nail is placed close to one end of a bar magnet.
The nail becomes an induced magnet.
Give two differences between an induced magnet and a permanent magnet.
The unmagnetised iron nail is attracted to both ends of the bar magnet.
Explain why.