In some old and modern articles and books there is discussed an idea that gravity law can result from the fact that atraction force between oppsite signes charges is slightly greater than the repulsion between the same sign charges. - yet a  deep physical question arises - why?  One can find in literature the follwing controversial answer - because in reality there exist only ... attraction forces, and the repulsion forces are the resulting oppositely  directed attraction forces caused  by other far distant surrounding  charges, whose existence is owing to the assumed matter neutrality. 

The idea of the electrical nature of gravitation expressed M. Faraday, John. Maxwell H. Lorentz, O. Heaviside and others. German physicists W. Weber and F. Zolner in 1882 proposed the concept of gravity, based on the difference between the forces of attraction and repulsion of electrical charges, which make up all of the body (the book of F. Zolner

«Erkliirung der universellen Gravitation», Leipzig, 1882). However, the physical reasons for the difference they have not specified. Much later, a possible cause of the excess power of attraction over the forces of repulsion expressed  by Sir A.  Eddington in his book "Fundamental Theory" (Cambridge, 1946, pp.103). He was guided by the principle of Mach: "Even in the simplest case, we obviously have to deal with possible action

just two particles, it is impossible to lose sight of the rest of the universe. " Electric field lines of the two charges of opposite sign extend from one charge to the next, and so this system is closed and is independent from the rest of the universe. The situation is different in the charge of one sign - here the lines of force go into space, ending up somewhere on the other sites. So naturally expected that the objects of the universe have some influence on the

interaction, reducing its strength."

The Lorentz article "Reflections on gravity" (Proc. Amst. Acad. 11, 1900, p. 559), and then Adamuti (I.А. Adamuti. Gen. Re1at. and Gravitation. Proc. 1 Ехр. Gravitation Symp.

Bucharest, 1980, p. 202)  develop the electrodynamic theory of gravity. It  like the mentioned model of Lesage, assumes some penetrating  electromagnetic radiation influence on the body from all sides and partially absorbed by them, when this actioin  is not compensated by pressure on the body of this radiation, which is partially screened by one side of the second body. Since the solid angle subtended by the body 2 by the body 1, is inversely proportional to the square of the distance r, the number of them is blocked by the particle radiation proportional to 11^-1 and as the number of absorbed particles is proportional to the  mass, the gravitational force is proportional to the mass of bodies. Consequently, the theory provides the law of gravitation. Speed of gravitation, of course, is equal to the speed of light. However, the theory gives rise to having a large resistance to movement of bodies with  oncoming flux, which is contrary to the experience: no slowing movement of the Earth and other celestial bodies in orbit  rotation is observed.

Lyttleton and Bondi suggested a   hypothesis  of electrical nature of gravitation, based on the assumption that the proton charge slightly (by 10^-18) is greater than the charge of the electron. (R. А. Lyttleton, Н. Bondi. Gravity and Electricuty. Proc. Roy. Soc,

1959, А252, p. 313)  They managed to obtain the  Newton's law, explaining  the observed expansion of the universe, the  Blacket law on the magnetic moment of the heavenly bodies and a number of other facts. However, the hypothesis refutes the  direct measurements of the charge of the electron and the proton,  which had proved  that their difference is less than 10^-21.   Despite this, the hypothesis of different tse charges of elementary particles put forward again and again  (N.E. Zaev. "Electromagnetic mass and gravity nature". Journal of the Russian Physical-Mathematical Society, 1992, N2 1-12, p. 32).  The idea of the electromagnetic nature of gravity has been developing  also by A.D. Sakharov, considering the latest results of the quantum fluctuations of fields. (A.D. Sakharov. "Vacuum quantum fluctuations in the curved spacetime and gravity theory". - Doklady AN SSSR, 1967, v. 177, p. 70).  However, the quantum theory of gravity has not been completed and its evaluation is premature. According to A. Barut, gravity is not connected with the static and dynamic effects of electromagnetic and gravitational interactions caused by the electromagnetic radiation produced by the distortion of the structure of elementary charge in the presence of a massive body (А. О. Barut. Gravity and Electromagnetism. - Proc. 2  Marcel Grossmann Meet. Gen. Relativity, Trieste, 1979. Part А. Amsterdam, 1982, p 163).    However, specific evaluations, allowing to  confirm or reject the hypothesis are  not presented.

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