4. What is electromagnet? where it is used.
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dog collar is a piece of material put around the neck of a dog. A collar may be used for restraint, identification, fashion, or protection. Identification tags and medical information are often placed on dog collars. Collars are often used in conjunction with a leash for restraining a dog
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Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
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