Question

If an iron piece is stroked 30–40time what will happen

Answer 1

Explanation:

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This is your answer ,

It will attract iron articles still but its magnetic field will be less than before .

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Answer 2

An iron strip can be converted into a magnet by the following method:

Place the iron strip on a table. Place one pole of a bar magnet near one end of the iron strip. Move the bar magnet along the length of the iron strip starting from one end to the other end as shown in the following figure. Then, lift the magnet and bring the pole to the starting point and move in the same direction as before.

On repeating this process for at least 30-40 times, the iron strip will become a bar magnet with two poles.