Solenoid

A solenoid is a coil wound into a tightly packed helix. In physics, the term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it. Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets. The term solenoid refers specifically to a coil designed to produce a uniform magnetic field in a volume of space (where some experiment might be carried out).

In engineering, the term solenoid may also refer to a variety of transducer devices that convert energy into linear motion. The term is also often used to refer to a solenoid valve, which is an integrated device containing an electromechanical solenoid which actuates either a pneumatic or hydraulic valve, or a solenoid switch, which is a specific type of relay that internally uses an electromechanical solenoid to operate an electrical switch; for example, an automobile starter solenoid, or a linear solenoid, which is an electromechanical solenoid.

Read more about Solenoid:  Magnetic Field and Vector Potential For Finite Continuous Solenoid, Inductance of A Solenoid

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Solenoid Voltmeter - Disadvantages
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Solenoid (DNA)
... The solenoid defines the packing of DNA as a 30 nm fiber of chromatin and results from the helical winding of at least five nucleosome strands ... of the octameric histones, called a solenoid ... DNA packed into solenoids, unlike DNA in nucleosome form, is not transcriptionally active ...
Solenoid Voltmeter - Operation
... Rather than using a D'Arsonval movement or digital electronics, the solenoid voltmeter simply uses a spring-loaded solenoid carrying a pointer (it might also be described as a form of moving ... Solenoid voltmeters usually have a scale on each side of the pointer one is calibrated for alternating current and one is calibrated for direct current ...
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Applications - Automobile Starter Solenoid
... In a car or truck, the starter solenoid is part of an automobile starting system ... The starter solenoid receives a large electric current from the car battery and a small electric current from the ignition switch ... car), the small electric current forces the starter solenoid to close a pair of heavy contacts, thus relaying the large electric current to the starter motor ...