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Linear solenoids are electromechanical devices that generate a uniform magnetic field when an electric current is applied to them. They are composed of a coil of wire wrapped around a moveable metal core. They are different from [rotary solenoids](/web/c/automation-control-gear/solenoids/rotary-solenoid/) because they exert a simple pushing or pulling force, as opposed to a rotational force.

**How do linear solanoids work?**

The wire coil on the outside of a linear solenoid is wrapped around the core in a corkscrew fashion. When electricity passes through the wire, a magnetic field is created which moves the mobile metal slug along the length of the solanoid's core.

**What are linear solenoids used for?**

The applications of linear solenoids take advantage of the ability to smoothly move the metal slug backwards and forwards. Linear solenoids are frequently used in automatic or high-security door-locking mechanisms. They're also used in car starter motors. When the current is switched on, the solenoid brings two points into contact. This completes a circuit, allowing electricity to flow to the necessary parts of the vehicle in order to start the engine.



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