Question

Difference between single touched method of magnet ion and double touched method of magnet ion

Answer 1

In the single-touch method, an iron bar is rubbed with a magnet repeatedly. To magnetise an iron bar AB using a bar magnet. Place one of the poles of a bar magnet, say the north pole, over one end of the iron bar, say end A. Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end, B, of the bar. On reaching end B of the iron bar, lift the bar magnet, bring the same north pole to point A of the iron bar, and then rub move the magnet from point A to point B again. The process needs to be repeated about 30 to 40 times. This process is called magnetisation of the iron bar by the single-touch method. The end A becomes the north pole and B the south pole, which can be checked by means of a magnetic compass or a bar magnet.

The double-touch method is similar to the single-touch method, except that two bar magnets of equal strengths are used instead of one.