what is a solenoid
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A solenoid is a coil wound into a tightly packed helix. The term was invented in 1823 by André-Marie Ampère to designate a helical coil. As a technical term in the study of electromagnetism, a solenoid is a coil that is "pipe-like" in the sense that its length is substantially greater than its diameter.
As a technical term in the study of electromagnetism, a Solenoid is a coil that is "pipe-like" in the sense that its length is substantially greater than its diameter. In practice, the coil is often wrapped around a metallic core, which produces a uniform magnetic field in a volume of space (where some experiment might be carried out) when an electric current is passed through it. A solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field. If the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet. The solenoid is not necessarily straight, for example, William Sturgeon's electromagnet of 1824 consisted of a solenoid bent into a horseshoe shape...