An external magnetic field induces an ergosphere in the magnetized Reissner-Nordström spacetime, enabling the electric Penrose process with efficiency set by metric coefficients, electromagnetic potential, and critical magnetic field values that mark onset and suppression of extraction.
Dadhich, The Penrose Process of Energy Extraction in Electrodynamics, ICTP Preprint, IC-80/98 (1980)
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Remarks on electrical Penrose process for magnetized Reissner-Nordstr\"om black hole
An external magnetic field induces an ergosphere in the magnetized Reissner-Nordström spacetime, enabling the electric Penrose process with efficiency set by metric coefficients, electromagnetic potential, and critical magnetic field values that mark onset and suppression of extraction.