Concept:Bar magnets are kept strong by storing them with soft-iron keepers to form a closed magnetic circuit and prevent demagnetization.
Explanation:When two bar magnets are placed together, the magnetic field can cause loss of strength over time.
To avoid this, place the two magnets so that their unlike poles face each other.
Then place soft-iron keepers at the two ends of the combined pair.
This arrangement creates a continuous magnetic path.
As a result, the magnetic domains remain aligned and the magnets retain their strength for a longer time.
Therefore, the correct storage method is unlike poles facing each other with keepers at the ends.
Answer:Unlike poles facing each other and the keepers placed at their ends.