How does null point change of bar magnet changes when magnet is rotated by 180?
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It can be changed by the direction of the magnet
If it canged to South it will be at south
If it changed to North it will be at North even if it is rotated by 180
If it canged to South it will be at south
If it changed to North it will be at North even if it is rotated by 180
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