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Electric Bell
the action is caused by an electromagnet (E). In its rest position the clapper is held away from the bell a short distance by its springy arm. When an electric current is passed through the winding of the electromagnet it creates a magnetic field that attracts the iron arm of the clapper,
Tape Recorder
Electric current flowing in the coils of the tape creates a fluctuating magnetic field. This causes the magnetic material on the tape, which is moving past and in contact with the main part, to align in a manner proportional to the original signal.
FUN FACT:If you cut a magnet in half, you get 2 smaller magnets as a result, each with their own north and south pole.