keeper

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keeper

Physics a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit when it is not in use

keeper

[′kēp·ər]
(electromagnetism)
A bar of iron or steel placed across the poles of a permanent magnet to complete the magnetic circuit when the magnet is not in use, to avoid the self-demagnetizing effect of leakage lines. Also known as magnet keeper.

strike plate, strike, striking plate

A metal plate or box which is set in a doorjamb and is either pierced or recessed to receive the bolt or latch of a lock, fixed on a door. Also see box strike plate.