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American early and middle 20th century telephone cables had load coils at intervals of a mile (1.61 km), usually in coil cases holding many. The coils had to be removed to pass higher frequencies, but the coil cases provided convenient places for repeaters of digital T-carrier systems, which could then transmit a 1.5 Mbit/s signal that distance ...
The hole in the center of the coil is called the core area or magnetic axis. [6] Each loop of wire is called a turn. [2] In windings in which the turns touch, the wire must be insulated with a coating of nonconductive insulation such as plastic or enamel to prevent the current from passing between the wire turns. The winding is often wrapped ...
An induction coil consists of two coils of insulated wire wound around a common iron core (M). [1] [7] One coil, called the primary winding (P), is made from relatively few (tens or hundreds) turns of coarse wire. [7] The other coil, the secondary winding, (S) typically consists of up to a million turns of fine wire (up to 40 gauge). [8] [1] [7]
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Inside the central "octopus", the field is within 1% of its central value B 0. The eight contours are for field magnitudes of 0.5 B 0, 0.8 B 0, 0.9 B 0, 0.95 B 0, 0.99 B 0, 1.01 B 0, 1.05 B 0, and 1.1 B 0. The calculation of the exact magnetic field at any point in space is mathematically complex and involves the study of Bessel functions.
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