Methods of magnetising substances
Answers
Explanation:
There are two methods generally used to magnetize permanent magnets: static magnetization and pulsemagnetization.
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Answer:
The two methods of magnetisation are:
i) Method of stroking – An iron nail or a steel bar can be magnetised by a bar magnet by a process of stroking. In this method, one pole of a bar magnet is used to stroke the iron nail held firmly on a surface. Stroke the iron nail from one end to the other and after reaching the other end, lift the magnet and repeat the process by bringing it back to the first end again. After about 30 strokes, we will observe that the iron nail has become a magnet when suspended freely. If the iron nail has been stroked by the north pole at the first end, that end becomes the north pole while the other end becomes the south pole.
ii) Electromagnetism – Magnets are also made using electric current. Such magnets are termed as electromagnets. These temporary magnets are created by wrapping a coil of wire (copper) around a soft iron core, such as a large nail. When electric current flows in this wire, a magnetic field is created around the wire. In some cases, the nail will remain magnetised even when removed from within the wire coil.
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