Charged black hole

Since the electromagnetic repulsion in compressing an electrically charged mass is dramatically greater than the gravitational attraction (by about 40 orders of magnitude), it is not expected that black holes with a significant electric charge will be formed in nature.

The mathematical solutions for the shape of space and the electric and magnetic fields near a black hole are named after the persons who first worked them out.

The solutions increase in complexity depending on which of the two parameters, J and Q, are zero (or not) (the mass M of a black hole could conceivably be tiny, but not zero).

The four categories of solutions are given in the table below: The solutions of Einstein's field equation for the gravitational field of an electrically charged point mass (with zero angular momentum), in empty space was obtained in 1918 by Hans Reissner and Gunnar Nordström, not long after Karl Schwarzschild found the Schwarzschild metric as a solution for a point mass without electric charge and angular momentum.

[citation needed] A mathematically oriented article describes that the Reissner–Nordström metric for a charged, non-rotating black hole.