i. Name the methods shown. ii. Give 2 points of difference between the methods.

Question

Observe the diagrams and answer the questions given below:

i. Name the methods shown.

ii. Give 2 points of difference between the methods.

Answer 1

i. Single touch and Double touch methods of magnetising a steel bar.

ii.

Single touch method	Double touch method
1. In this method, one magnet is used to magnetise the steel bar.	1. In this method, two magnets are used to magnetise the steel bar.
2. In this method, the magnet is dragged from one end of the steel bar to another end.	2. In this method, two magnets are dragged from the middle of the steel bar to the opposite directions.
3. As only one magnet is used to induce magnetism, this method is called single touch method.	3. As two bar magnets are used to induce magnetism, this method is called double-touch method.
4. The magnetism created by this method is of low strength and lasts for a short time.	4. The magnetism created by this method is of high strength and lasts for a longer time.