Describe a method by which an iron bar can be made a magnet.

We can use the double touch method to make an iron bar into a magnet.

Double Touch Method :

1. Take two magnets, P and Q, and an iron bar AB.
2. Place the magnets vertically at the centre of the bar with their opposite poles on the same side.
3. Keep a cork between the poles of the two magnets.
4. Move the magnets together with the cork from the centre towards the end B of the bar.
5. Without lifting the magnets, slide them back to the end A.
6. Repeat this forward and backward movement about 20 times.
7. Turn the bar upside down and repeat the same process another 20 times.
8. The iron bar becomes a magnet:
   • End A becomes the north pole.
   • End B becomes the south pole.