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Read the text, please. MAGNETISM In studying the electric current, scientists observe the following elation between magnetism and the electric current: on the one hand magnetism is produced by the current and on the other hand he current is produced from magnetism Magnetism is mentioned in the oldest writings of man. Romans for example, knew that an object looking like a small dark stone had the property of attracting iron. However, nobody knew who discovered magnetism or where and when the discovery was made Of course, people could not help repeating the stories that they had heard from their fathers who, in their turn, heard them from their own fathers and so on. One story tells us of a man called Magnus whose iron staff was pulled to a stone and held there. He had great difficulty in pulling his staff away. Magnus carried the stone away with him in order to demonstrate its attracting ability among his friends. This unfamiliar substance was called Magnus after its discoverer, this name having come down to us as Magnet. According to another story, a great mountain by the sea possessed so much magnetism that all passing shi ps were destrayed because all their iron parts fell out. They were pulled out because of the magnetic force of that mountain. The earliest practical application of magnetism was connected with the use of a simple compass consisting of one small magnet pointing north and south. A great step forward in the scientific study of magnetism was made by Gilbert, the well-known English physicist (1540-1603). He carried out various important experiments on electricity and magnetism and wrote a book where he put together all that was known about magnetism. He proved that the earth itself was a great magnet. Reference must be made here to Galileo, the famous Italian astronomer, physicist and mathematician. He took great interest in Gilbert's achievements and also studied the properties of magnetic materials. He experimented with them trying to increase their attracting power. One of his magnets, for example, could lift objects weighting 25 times its own weight. At present, even a schoolboy is quite familiar with the fact that in magnetic materials, such as iron and steel, the molecules themselves are minute magnets, each of them having a north pole and a south pole. When iron and steel are magnetized, the molecules arrange themselves in a new orderly way instead of the disarrangement in which they neutralize each other. Dividing a bar magnet into two parts, one finds that each of the two parts is a magnet having both a north pole and a south pole. Thus, observers obtain two magnets of a smaller size instead of having a single one of a larger size. Dividing one of these two smaller magnets into two will give the same result. Thus, this process could be continued, always getting similar results. On placing an unmagnetized iron bar near a strong magnet, it is magnetized. Rubbing the magnet is not required for that process In other words, the iron bar has been magnetized by the strong magnet without rubbing it.
III. Give complete answers to these questions: 1. When was magnetism mentioned? 2. What did Romans know about magnetism? 3. What are the legends about magnetism? 4. What was the earliest practical application of magnetisn 5. Who was Gilbert? What did he do? 6. Who was Galileo? What was his interest in? 7. What fact is each schoolboy familiar with? 8. What can be found dividing a bar magnet into two parts?