Question

A steel bar can be magnetised permanently by rubbing a bar magnet.

• A. along its length
• B. at its ends
• C. at its centre
• D. none of these

Answer 1

The correct option is A

along its length

Explanation of correct option:

1. A unmagnetised magnetic substance can be converted into magnetic substance by various methods.
2. Single touch, double touch, divided touch, electric field.
3. A permanent bar magnet is taken and its one pole is placed on one end of the steel bar then drawn to the other end pressing along its length, keeping it in the inclined position.
4. The permanent magnet is then lifted and the process is repeated several times.
5. The specimen is then turned over and the other side is also magnetised in the same way.
6. The steel bar gets magnetised in this way.
7. This is known as single touch method.

So, the correct option is (a).