What is magnetic keeper?
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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.
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Magnetic keeper is a piece of wood or soft iron which is used in storing magnets because bar magnets get demagnetized when the poles are left free for a long time . In order to preserve the magnetism of the magnets , a keeper is kept across a pair of bar magnets with unlike poles besides each other
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