What are magnetic keepers? How magnetic keepers are used to store magnets

What are magnetic keepers? How magnetic keepers are used to store magnets.

Magnetic keepers are soft iron bars placed at either end of the pair of magnets. It is used to avoid self-demagnetisation of magnets.

The magnets are arranged in pairs with opposite poles facing each other. Two soft irons are placed at the either end of the pair of magnets.