Question

What are keepers? Why are they used​

Answer 1

Answer:

A magnet keeper, also known historically as an armature, is a bar made from magnetically soft iron or steel, which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit;

Explanation:

it is important for magnets that have low magnetic coercivity

Answer 2

• A magnet keeper, also known as an armature historically, is a bar made of magnetically soft iron or steel that is placed across the poles of a permanent magnet to help preserve the magnet's strength by completing the magnetic circuit; it is particularly important for magnets with low magnetic coercivity, such as alnico magnets.

• Keepers also serve as a safety feature by preventing foreign metal from being drawn to the magnet. Many magnets, such as supermagnets, do not require keepers because their coercivities are so high; only those with lower coercivities, which are more vulnerable to stray fields, must.