Physics
Write down any three ways of magnetising a magnetic substance.
Magnetism
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Answer
Three ways of magnetising a magnetic substance are:
1. Single Touch Method : In this method, a bar magnet is taken and one of its poles is rubbed along the length of an iron bar in one direction only from A to B as shown in below figure.
This process is repeated several times and after some time, the iron bar becomes magnetised, with one end acting as the north pole and the other as the south pole.
2. Double Touch Method : In this method, two identical bar magnets are taken. Their opposite poles are placed at the centre of an iron bar and then rubbed simultaneously from the centre towards the opposite ends as shown below :
This process is repeated many times and as a result, the iron bar gets magnetised.
3. Electrical Method : In this method, an insulated copper wire is wound around a soft iron rod to form a coil as shown below
When electric current is passed through the coil, the iron rod becomes magnetised and acts as an electromagnet and when the current is switched off, the magnetism disappears.
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