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A coil with a core which is a straight bar or other non-loop shape is called an open-core coil. This has lower magnetic field and inductance than a closed core, but is often used to prevent magnetic saturation of the core. A coil without a ferromagnetic core is called an air-core coil. [14]
To concentrate the magnetic field in an electromagnet, the wire is wound into a coil with many turns of wire lying side by side. [2] The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. [2] A coil forming the shape of a straight tube (a helix) is called a solenoid. [1] [2]
Coil (chemistry), a tube used to cool and condense steam from a distillation; Coil spring, used to store energy, absorb shock, or maintain a force between two surfaces; Inductor or coil, a passive two-terminal electrical component; Electromagnetic coil, formed when a conductor is wound around a core or form to create an inductor or electromagnet
Mortal coil" is a poetic term for the troubles of daily life and the strife and suffering of the world. It is used in the sense of a burden to be carried or abandoned. To "shuffle off this mortal coil" is to die, exemplified in the "To be, or not to be" soliloquy in Shakespeare's Hamlet.
A current-carrying coil of wire induces a magnetic field according to Ampère's circuital law. The greater the current I , the greater the energy stored in the magnetic field and the lower the inductance which is defined L = Φ B / I {\textstyle L=\Phi _{B}/I} where Φ B {\textstyle \Phi _{B}} is the magnetic flux produced by the coil of wire.
This consists of two coils with the same number of turns connected in series, one inside the other. The inner coil is mounted on a shaft so its axis can be turned with respect to the outer coil. When the two coils' axes are collinear, with the magnetic fields pointing in the same direction, the fields add and the inductance is maximum.
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But when the small coil is moved in or out of the large coil (B), the magnetic flux through the large coil changes, inducing a current which is detected by the galvanometer (G). [1] A diagram of Faraday's iron ring apparatus. Change in the magnetic flux of the left coil induces a current in the right coil. [2]