User:Sidam/Magnetoelectric force

'Magnetoelectric force' – the phenomenon of mechanical (ponderomotive) action or interaction of a magnetic current by the own electric field, owing to the magnetoelectric induction.

       The ponderomotive action of the magnetoelectric force on the charged macroscopic body in the first time experimentally was presented by O. Lodge (1889) [1] in the experiment with an orientation of the “electric needle”, similarly to the known experiment of H. Ch. Oersted (1820) with an orientation of the “magnetic needle”, though the itself such fact of a production of a curl electric field and electromotive force, acting on electric charges, is known from 1831 year (the time of the discovery of the phenomenon of magnetoelectric induction by M. Faraday).  
      The return mechanical (ponderomotive) action of an external electric field on a magnetic with a magnetic current of polarisation, in the form the phenomenon of magnetodynamic forces, was experimentally (in the first time) investigated for the macroscopic systems in 1984 – 1988 years (A. M. Sidorovich, V. A. Sichik [3]) and theoretically substantiated, as a  verification of the Heaviside’s hypothesis (1893) [2].  
       The magnetoelectric forces, along with the electrostatic forces, are classified as the ponderomotive forces, which action in an electric field. Together with this they occur no only in the contour with a magnetic current, placed in an external electric field, but and in a solitary contour, when the electric field is defined by the magnetic current in the same contour.   
       The characteristic generality of the nature of the magnetoelectric forces (magnetodynamic forces [2, 3]) and electrostatic forces exists, the unity of which in the first time was partly noted by H. Hertz (1884) [4] (with the use of another terminology), similarly to the known Ampere’s Principle of unity forces for electrodynamic forces (electromagnetic forces) and magnetostatic forces. The mechanical forces, leaving on the dielectric bodies and the charged particles in an inhomogeneous electric field of magnetic currents, also are classified as the magnetoelectric forces. 
      Therefore, the magnetoelectric forces are classified in the composition of the mechanical forces of interaction of magnetic currents of polarisation and the contained its bodies with one another and with the external electric field (in a dielectric or conductive intermediate medium) and with the charged bodies (involving the electrets), the forces in a solitary contour with a magnetic current. The direct objects of an action of the magnetoelectric forces are the displacing carriers of magnetic moment (the magnetic polarisation currents) and the contained its bodies, and also electric charges and its carriers (the electrically charged particles or bodies).  
       In common case the value of the magnetoelectric forces and moments, acting in an electric field, is determining (according to the method of the virtual displacements) by the possible rate of a change of the potential energy, accumulated in the electric field, at displacement of a movable path of the object of the force action, namely:

                            $F_{x}={\frac {\partial {A_{e}}}{\partial {x}}}$ 

where: $F_{x}\$ is the general force (the ponderomotive force or torque);

$x\$ is the general co-ordinate (the linear or angular displacement). 

       The concrete analytical relationships (in accordance with the above-presented common expression) for the various cases of the magnetoelectric ponderomotive interactions have sufficiently much of the variants. At interaction of the magnetic current with an external electric field or with one another the magnetoelectric forces [1] are equivalent to the electrodynamic forces [2, 3], also as the analytical relationships for them are identical.

References

• [1] Lodge O. On the Electrostatic Field produced by varying Magnetic Induction. // Philos. Mag., 1889, vol. 27, N 6, p. 469-479.
• [2] Heaviside O. On the Forces, Stresses and Fluxes of Energy in the Electromagnetic Field // Phil.Trans.Roy. Soc.Ind., 1893, vol. 183A, p. 423-480.
• [3] Sidorovich A., Sichik V. Experimental Verification of Magnetodynamic Forces // Electromagnetic Fields in Electrical Engineering: Proc.Int.Symp., Lodz, 20-22 Sept. 1989 -- Lodz, 1989, p. 309-312.
• [4] Hertz H. Über die Beziehungen zwischen den Maxwell‘schen elektrodynamischen Grundgleichungen und den Grundgleichungen der gegnerischen Elektrodynamik. – Ann. d. Phys., 1884, 23, S. 84-103.