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A solenoid is a coil of enameled or insulated wire in a corkscrew shape wrapped around a rod-shaped armature usually made of iron. A solenoid is an electromechanical device capable of producing a magnetic field and motion of the armature. Solenoids have wide applications which include use in automobile starters, switches, valves and inductors in electronic circuits.
The core material in a solenoid is of a ferromagnetic nature. As a result, a magnetic field in an activated solenoid has negative and positive poles, and can attract or repel materials which are sensitive to magnets. The electromagnetic field in a solenoid results in the armature moving forward or backward due to the solenoid coil. Solenoids are either used to generate a controlled magnetic field or act as a transducer device capable of producing linear motion. Solenoids are extremely helpful for numerous applications, including automated equipment.