FIELD OF A DIPOLE IN CHARGED BLACK-HOLE ELECTROSTATICS

By using the solution of Adler and Das for Maxwell's equations in a Reissner-Nordström optimally charged background metric, the field of a static electric dipole is found and then, by a duality rotation, we find the field of a static magnetic dipole. A generalization of the concept of electric-dipole moment is proposed for static dipoles in curved manifolds, and the behaviour of the fields both for the dipole very near and very far from the singular surface of the Reissner-Nordström geometry is studied. © 1979 Società Italiana di Fisica.