A charged black hole is a black hole that possesses electric charge. 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.
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The two types of charged black holes are Reissner–Nordström black holes (without spin), and Kerr–Newman black holes (with spin).
A black hole can be completely characterized by three (and only three) quantities: