What would happen if we have a black hole and we start shooting at it a single electron at a time, and go on doing it forever? Would the electrons start to bounce off eventually?
Answer
There is a limit on how much charge a black hole may have: http://en.wikipedia.org/wiki/Extremal_black_hole
In general, rotating, charged black holes is described by a Kerr-Newman metric.
Intuitively, eventually the Coulumb repulsion is enough that a charged particle which does not contribute more mass than charge will be repelled.
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