Question

why are magnets kept in pairs
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Answer 1

Explanation:

Magnets become weaker with time (due to 'free' poles) near the ends repelling each other and upsetting alignment of tiny magnets). To prevent this bar magnets are stored in pairs with unlike poles opposite and pieces of soft iron - keepers across the ends.

Answer 2

Answer:

Magnets become weaker with time (due to ‘free’ poles) near the ends repelling each other and upsetting alignment of tiny magnets).

To prevent this bar magnets are stored in pairs with unlike poles opposite and pieces of soft iron - keepers across the ends.

The keepers become induced magnets and their poles neutralise the poles of the bar magnets.