Ok, another physics question. Not related to the Big Bang, but I didn't
want to create a new thread.

  It seems that a black hole can be characterized by three (and only three)
quantities: its mass, angular momentum and electric charge. For example the
Reissner-Nordstr?m metric is a solution to the general relativity equations
for a charged, non-rotating black hole.

  I don't understand. Electric charge is mediated by photons. Photons cannot
escape a black hole. How can they mediate anything in this case? A black
hole swallows photons, it doesn't exchange them with anything.

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                                                          - Warp

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