Here is the metric for an uncharged non-rotating black hole:(adsbygoogle = window.adsbygoogle || []).push({});

http://en.wikipedia.org/wiki/Schwarzschild_black_hole

Here is the metric for a charged non-rotating black hole:

http://en.wikipedia.org/wiki/Reissner-NordstrÃ¶m_black_hole

Note that this is the same as plugging M^{*}= M - Q^{2}/2r into the Schwarzschild metric.

My question is: If there is energy in the electric field of a charged particle, why doesn\'t thisincreasethe effective mass?

Is this true for any quantum \"charge\"? For instance, if the blackhole has excess \"weak charge\" or \"color\", does this decrease the radius of its event horizon/effective mass?

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# Charged black hole

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