The electric charge on rotating black holes is calculated to be ∼BJ in the force-free configuration of Ghosh, with a horizon flux of ∼BM2. This charge is gravitationally weak for B∼1015 G, so that the Kerr metric applies. Being similar to the electric charge of a magnetar, both electric charge and magnetic flux should be, in sign and order of magnitude, continuous during stellar collapse into a black hole. Extraction of the rotational energy from newly formed black holes may proceed by interaction with the magnetic field.
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