Question

WHAT HAPPENS IN THE IRON BAR THAT IT IS CONVERTED INTO A MAGNET BY RUBBING IT WITH A STRONG BAR MAGNET ?

Answer 1

Dear Student,

“Touch and Stroke” method is used to make an iron rod into a magnet.The procedure is as follows:

1. An iron rod is kept in contact with a bar magnet in such a way that one of its poles touches with one edge of the iron rod.
2. The bar magnet is moved along the whole length of the iron bar.
3. Now when it is reached the other end of the rod,lift the magnet and bring the pole (the same pole you started with) to the same point of the iron rod from which we began.
4. Move the magnet again along the iron bar in the same direction
5. Repeat this process about 30-40 times. The iron rod will become magnetised

Each molecules of a magnetic substance are tiny magnets.They are arranged in a similar order so that similar poles will point in the same direction.Thus we get north and south poles.
In the case of an iron rod,these molecules form a closed chain.So in the normal state iron rod will not behave as a magnet.When it is rubbed with a bar magnet,the chains are broken up.Now the molecules are arranged in a regular order which points in the North to south direction.Thus the iron rod gets magnetised.
Regards..