Question

Fix a powerful bar magnet to a stand as shown in the figure. Fix an iron bar at a short distance below the magnet. Take iron filings near the iron bar. What do you see?

After some time, take the magnet away. What happens now?

Iron filings stick to the iron bar when the magnet is near it and fall off as soon as the magnet is taken away. That is, the magnetism in the bar vanishes.

Answer 1

1. When a powerful bar magnet is kept near the iron bar, the iron bar becomes temporarily magnetised.
2. Therefore, when iron filings are brought near the iron bar, they are attracted towards it and stick to it.
3. When the bar magnet is taken away, the iron bar loses its magnetism.
4. As a result, the iron filings are no longer attracted and fall off the iron bar.
5. An iron bar can acquire magnetism when a magnet is brought near it, but this magnetism is temporary and disappears when the magnet is removed.