magnetic coil
91Multiple coil magnet — The multiple coil magnet was invented by Joseph Henry in 1831. It is an electromagnet that has several coils of wire connected in parallel. This increases the total electric current in the electromagnet and therefore generates a stronger magnetic …
92field coil — Elect. a coil that generates a magnetic field when an electric current is passed through it: used in various electrical devices, as motors, generators, or electromagnets. * * * …
93voice coil — noun a) A coil of wire attached to the apex of the cone of a loudspeaker that provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. b) A similar mechanism that positions the disk read write… …
94surface coil — a receiver coil in magnetic resonance imaging that lies against the surface of the object being imaged …
95field coil — /ˈfild kɔɪl/ (say feeld koyl) noun a coil of wire used for producing a magnetic field as in a dynamo …
96moving-coil galvanometer — noun a galvanometer that is operated by the force exerted by an electric current flowing in a movable coil suspended in a magnetic field • Hypernyms: ↑galvanometer • Hyponyms: ↑ballistic galvanometer …
97focusing coil — noun : a coil that focuses an electron beam (as in a cathode ray tube) by means of a magnetic field …
98helmholtz coil — ˈhel]mˌhōlts, ˈheu̇] noun Usage: usually capitalized H Etymology: after Hermann L.F. von Helmholtz died 1894 German physicist : one of two equal parallel coaxial circular coils in series that are separated from each other by a distance equal to… …
99Typical magnetic fields — ▪ Table Typical magnetic fields inside atomic nuclei 1011 T in superconducting solenoids 20 T in a superconducting coil cyclotron 5 T near a small ceramic magnet 0.1 T Earth s field at the equator 4(10−5) T in interstellar space 2(10−10) T See as …
100Helmholtz coil — noun one of a pair of flat coils, having equal numbers of turns and equal diameters, arranged on a common axis and connected in series; used to obtain a nearly uniform magnetic field without the use of a long solenoid …
