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.
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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.