Respuesta :
B) The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
What is single touch method of making a magnet?
Single touch method is one of various ways of making a magnetic material like soft iron into a magnet.
In this method one end of the magnet (say north pole) is placed at one end of the iron piece and then rubbed over the bar from end to other, then lifted and brought back to first end.
According to the question,
The nail will stick to the bar magnet because it will become magnetized. The presence of the nearby north pole rearranges the magnetic domains inside the steel so that their south poles all point toward the north pole of the permanent magnet.
As a result, the other end of the nail becomes a north pole.
If you bring a bar magnet close to the first iron nail, you can lift the the first iron nail with the magnet and also it will attract and lift the second iron nail.
To attract or even lift the third magnet will depend on the distance.
Hence , the nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
Learn more about temporary magnet here:
https://brainly.com/question/9966993
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