is it possible to have a bar magnet in which magnetic strength of north pole is different from south pole.? suppose 2 bar magnet of same strength and same length are connected in series such that north pole is connected to south pole and south to north. can we replace their combination by a bar magnet whose centre coincides and strength becomes double?

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Solution

No,the pole strength of two poles of bar magnet is the same.
No, it is not exactly double. Two magnets together are stronger than one magnet but will not be twice as strong as one.
When magnets are joined together such that the north pole of one magnet is connected to the south pole of the other magnet and south pole of one magnet is connected to the north pole of the other magnet, then the strength will be slightly less than twice as strong as one magnet. We can add the magnetic fields together. Thus, we can't replace this combination of magnets by a bar magnet whose strength is doubled.

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