This is the basic working principles behind a solenoid but instead of picking up metal filings, the magnetism generated is used to move an armature which can do work.
In most appliance solenoids, instead of having a stationary pin (nail in the illustration above) around which the coil of wire is wrapped, the coil is wrapped around a hollow tube. Through the center of this tube a metal armature is installed which is affected by the magnet field produced whenever power is supplied to the coil. This armature can be attached to levers to lock or open a door for example and powered via an electrical switch when needed to activate it.
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