If a hole is made at the centre of a bar magnet then its magnetic moment will be
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The seperation between the poles can be taken as the length of the bar magnet ( though the seperation of the poles is slightly less than the length). When a hole is cut in the bar magnet, the pole strength does not change, as the number of free poles at the ends do not change. Length does not change.
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it is less than the actual magnetic moment
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