Bifilar Coil
https://en.m.wikipedia.org/wiki/Bifilar_coil
Bifilar Coil (Scalar)
Counter-Wound (Parallel)
Nikola Tesla's flat inductive bifilar coil is an electromagnetic coil that contains two closely spaced, parallel windings.
Description and applications
Bifilar coil configurations
- parallel-wound (series)
- parallel-wound (parallel)
- counter-wound (series)
- counter-wound (parallel)
Some bifilars have adjacent coils in which the convolutions are arranged so that the potential difference is magnified, the current flows in same parallel direction.
Others are wound so that the current flows in opposite directions. The magnetic field created by one winding is therefore equal and opposite to that created by the other, resulting in a net magnetic field of zero (i.e., neutralizing any negative effects in the coil). In electrical terms, this means that the self-inductance of the coil is zero.
Bifilar wound toroidal transformer.
Bifilar coils impose an inductance in the common mode, but impose no inductance in the differential mode. Coils in such a combination are widely used to eliminate ingress or egress of common mode signals from electronic signalling circuits.
Nikola Tesla patented the Bifilar Coil on January 9, 1894, referring to it as a “Coil for Electro Magnets”.
Series & Parallel Circuit
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LINKS
http://scalarphysics.com/resources.php
http://jnaudin.free.fr/html/scalwidx.htm
RE: Wickland