The small iron bar does not always rest along the north-south direction; it can rest in any direction.
NCERT Book Curiosity Science Class 6
Class 6 Science NCERT Chapter 4
What happens when a small iron bar is used in place of a bar magnet in the same activity?
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When a small iron bar is used instead of a bar magnet, it does not align itself with the Earth’s magnetic field. It lacks inherent magnetism and won’t act as a directional indicator like a magnet.