Mention the four methods by which an iron bar/needle can be made
a magnet.
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Explanation:
Single touch method: Place the iron bar (or the needle) AB on a table. Take a bar magnet NS and place It almost vertical with its north pole (N) on the end A of the bar. Move the magnet along tire iron bar till the other end 8 is reached.
Lift the magnet at the end B and again place it on the first end A Again stroke the bar. Repeat the process about 20 times, Then turn the iron bar AB upside down. Again Stroke it with the mag-net about 20 times. The bar now becomes a magnet.
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