  We derive and discuss the physical interpretation of a conformally flat,
static solution of the Einstein-Maxwell equations. It is argued that it
describes a conformally flat, static spacetime outside a charged spherically
symmetric domain wall. The acceleration of gravity is directed away from the
wall in spite of the positive gravitational mass of the electric field outside
the wall, as given by the Tolman-Whittaker expression. The reason for the
repulsive gravitation is the strain of the wall which is calculated using the
Israel formalism for singular surfaces.
