Two unequal charges attract each other because the positive charge produces VPs that can interact directly with the negative charge. In this sense, two unequal charges support each other and a flow of VPs from the positive to the negative charge takes place. There is also a flow of VGs from the negative to the positive charge that is probably only partial, since a part of the VGs might flow back to the BF due to their extreme "volatility".

Remembering that there is a flow of VPs from the positive to the negative charge, if we try to move away each other two unequal charges, the strings in the combined electric field get tensed and a resistance appears since we are working against the field that is attractive.

On the contrary, if we approach two unequal charges, we work in the same direction of the field, no tension appears and the charges attract each other. Since the tension of the strings increases if we move away two unequal charges each other, and it decreases in the opposite direction, two unequal charges always tend to attract mutually.

According to the above model, in a neutral atom, there is a closed circuit of VPs between protons and electrons. Protons absorb VGs from the BF and produce VPs that interact with electrons and are again converted into VGs. A positive ion has an excess of protons that produces an excess of VPs that leaves the atom along field lines. On the contrary, in a negative ion, the excess of electrons interact with surrounding VPs and a negative electric field appears by means of field lines of VPs that enter into the atom. In consequence, an atom is electrically neutral if there is no interchange of virtual particles with the surrounding space. Furthermore, without the BF, any positive charge or ion would be electrically neutral since there would be no VGs to interact with and no VPs could therefore be emitted. Negative charges would also be electrically neutral in this case, since there would be no VPs to interact with.