Double-Reissner-Nordstrom solution and the interaction force between two spherical charged masses in general relativity

The physical representation of the general double-Reissner-Nordstrom solution is obtained by rewriting the N=2 Breton-Manko-Aguilar electrostatic metric in the Varzugin-Chistyakov parametrization (M-i,Q(i),R). A concise analytical formula is derived for the interaction force between two arbitrary Reissner-Nordstrom constituents, and an example of the equilibrium configuration involving two oppositely charged particles which confirms earlier Bonnor's prediction of the existence of such configurations is given.