write one of the main uses of an electromagnet .
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Electromagnets are very widely used in electric and electromechanical devices, including:
Motors and generators.
Transformers.
Pickups.
Relays.
Electric bells and buzzers.
Loudspeakers and headphones.
Actuators such as valves.
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks
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