There is  Ampere's law, however what its nature – it is not known.  

Ampere's law

Unified Theory of Nature discovers the mechanism of deep appearances and processes which lead to this law.

Whence  Ampere's law arises. The following streams from the Unified Тheory. The motion of electrons (of microvortexes), i.e. the electric current (Progress of microvortexes see), will be because of the viscous friction with maternal ether - the return Gravitation (Essence of Gravitation, consequence 3 see) to provoke the fluxion of maternal ether insame direction along the conductor*. 

In turn the ether flow will resist to the motion along the conductor at cause of the friction of this ether about fixed (though the fluctuating in thermal motion) elements of the crystal lattice. According to the Unified Theory each microvortex (the electron) has own interior transit flow of ether (Own magnetic field of an electron see), then these microvortexes are built by the own transit flow in same direction, as the gravitating (because of travel of microvortexes – electrons along the conductor **)  ether (see above about the return gravitation). As result all travelled microvortexes (electrons) are polarised (fig. 12).  

As a microvortex (an electron) has two gyrations: the longitudinal and the cross of a microvortex torus (the spin and the charge of an electron see) then the jets of ether of each polarised microvortex will make the polarising influence on the next maternal ether also, namely across the plane of the vortex and along the vortex plane.

The motion of maternal ether outside and in of the microvortexes is integrated in one general motion in the conductor, which because of the viscosity of ether starts in same motion the maternel ether outside of the conductor (the magnetic field about the conductor).

Fig. 24. Physical essence of "Ampere's law". а – the polarisation of the microvortexes ("the electrons"); b - the occurrence of the circumferential flow of ether ("the magnetic field"); 1 – an   electron; 2 – a conductor; 3 – the gyration of the flow of ether in a conductor; 4 – the circumferential flow ether ("the magnetic field"). 

Interaction (friction) in next cross-sections (fig. 24 a) of trickles of maternal ether, flowing in the conductor and rotating cross the conductor, leads to following. It is appeared the general gyration of their family round the general centre (the close to the conductor axis) in the direction same name with the motion direction in the microvortexes - electrons (fig. 24 b). Accordingly the family of the microvortexes about same centre will be (see **) move (to rotate) in opposite direction slowly (because of the  friction reaction about elements of crystal lattice of the conductor)***.     

Ampere's law is observed not always.  From depending on requirements the direction of motion of ether about the conductor (magnetic field direction see) will prevail in the longitudinal direction of jets of ether in the microvortex (i.e. across the conductor – "Ampere's law") or in the cross direction of ether in the microvortex (along the conductor, i.e. not on "Ampere's law").  

So at the isolated conductor (a reel coil) the longitudinal - the spin gyration in the microvortex (Spiral vortex and Spin see), i.e. across the conductor ("Ampere's law") will prevail. At  the wind of the usual single-layer reel or the unidirectional wind of the multilayered reel the orientation of the polarised microvortexes (the electrons) does not change. Here the perfect analogy of cross adjunction of the two coils to the cross adjunction of two magnets (Fig. 13 see). Accordingly "Ampere's law" will be observed here again and the resulting from it the direction of the magnetic field of the reel.

At reduction of diameter of the single-layer reel (or its flattening) the fluxion of maternal ether round conductor leads to following. These fluxions from two opposite sides of a coil in the reel start to flow in skewcollide [23] condition and in process of reduction of diameter of the reel in all less steady. As result in the reel the ether flow retards  own lengitudinal (concerning the reel axis) motion.  

In the indicated requirements it is started to be retarded the longitudinal - the spin motion of ether in the microvortex, that bound by viscosity with the maternal ether. This automatically leads to the acceleration in the microvortex of the cross - the charge gyration of jets (i.e. the impulse is maintenanced). The cross propumping in the microvortex of maternal ether is amplified. Accordingly, instead of the longitudinal fluxion of ether there is the cross rotary movement of ether inside and outside of the solenoid. At a small enough diameter of indicated reel and the dense wind (a coil to a coil) this cross motion will be almost perpendicular to reel axes (i.e. cing to the polarisation of microvortexes in the reel coils, see above). This motion unlike on the longitudinal (existing on "Ampere's law") will be steady, as the gyration of ether  into the solenoid, and outside guided to one direction. Thus, "Ampere's law" is not observed in these conditions (see Experience No. 1 and No. 2).

Introduction of a core (from the magnetically-soft material) in the solenoid (the reel) magnetises the core (body magnetization see) and converses the ethereous pump into the usual solenoid from spinal to chargeal ("The spin and the charge of an electron" see above). As the core magnetisation leads to that all electrons are polarised across the longitudinal  flow of  ether in the solenoid, then the magnetic field in the solenoid with the core is the field not of the reel, but the magnet ("The spin and the charge of an electron" see above). And as in a magnet the pumping  goes by the electronic charge (What is the magnetic field? see ) and in a solenoid (see above) by the spin, then in an usual reel with a core there is the much bigger pressure of ether – "intensity of magnetic field".

 *For phenomenon generality we will view the case of a conductor with high voltage (high pressure of microvortexes – electrons), when the wire cross section is filled by microvortexes (electrons) practically all.

** At the known slow motion of electrons in a conductor (≈ 1 mm/c [1]) the viscous (the gravitational) action of the resisting maternel ether on a microvortex ("electron") is rather considerably. It streams from that "an electron" (the microvortex), having  size of 3∙10^-15 m, and thickness of a jet of the microvortex considerably smaller, should at the travel of the electron with v ≈ 1 mm/c make more than 10^-3 m : 10^-15 m ≈ 10¹²  turns in a second in the cross gyration (The cross gyration in a microvortex see), but in the longitudinal many more (The cross motion will be not such active, as the longitudinal see).

*** At low voltage (see *) the maternal ether will rotate in opposite direction into a stratum of electrons in the conductor.