On neutralization of charged black holes

Understand

For non-spinning, charged (Reissner-Nordstr\"om) black holes, the particles with an opposite sign of charge with respect to that of the black hole will be pulled into the black hole by the extra electromagnetic force.

• Such a hole will be quickly neutralized so that there should not exist significantly charged, non-spinning black holes in the universe.
• The case of spinning, charged (Kerr-Newmann) black holes is more complicated.
• For a given initial position and initial velocity of the particle, an oppositely charged particle does not always more easily fall into the black hole than a neutral particle.