A natural mechanism to induce an electric charge into a black hole
  We present a natural mechanism which may induce an electric charge into an accretting black hole in the presence of a strong, high energy radiation field. We study this mechanism using Newtonian physics, and we also discuss the process within the context of a Kerr Newman black hole. Finally, we consider possible astrophysical applications in X-ray variability and jet formation in the Active Galactic Nuclei (AGN). 
Jos\'e A. de Diego, Deborah Dultzin-Hacyan, Jes\'us Galindo Trejo,   Dar\'io N\'u\~nez