Question

(1) A steel bar can be permanently magnetised:

(a) by placing it in contact with a bar magnet for an hour

(b) by rubbing bar magnet along its length

(c) by rubbing the bar magnet at its ends

(d) by rubbing the bar magnet at its centre

Please help me to solve this physics question.
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Answer 1

Answer:

(a) by placing it with a bar magnet for an hour

Explanation:

For explaination, to start with steel is a soft iron, which makes it easy to be converted to a magnet. When a nonmagnetic piece of steel is applied to a magnet, the atoms within it rearrange themselves in a manner that creates a permanent magnet. As the atoms become aligned, they create a magnetic field that doesn't lose its strength.

Answer 2

Answer:

(a) by playing it with a bar magnet for an hour

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