Energetics of the Kerr-Newman black hole by the penrose process

@article{Bhat1985EnergeticsOT,
  title={Energetics of the Kerr-Newman black hole by the penrose process},
  author={M Bhat and Sanjeev V. Dhurandhar and Naresh Dadhich},
  journal={Journal of Astrophysics and Astronomy},
  year={1985},
  volume={6},
  pages={85-100}
}
We have studied in detail the energetics of Kerr-Newman black hole by the Penrose process using charged particles. It turns out that the presence of electromagnetic field offers very favourable conditions for energy extraction by allowing for a region with enlarged negative energy states much beyondr = 2M, and higher negative values for energy. However, when uncharged particles are involved, the efficiency of the process (defined as the gain in energy/input energy) gets reduced by the presence… 
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