Dynamics of Particles Around a Regular Black Hole with Nonlinear   Electrodynamics
  We investigate the dynamics of a charged particle being kicked off from its circular orbit around a regular black hole by an incoming massive particle in the presence of magnetic field. The resulting escape velocity, escape energy and the effective potential is analyzed. It is shown that the presence of even a very weak magnetic field helps the charged particles in escaping the gravitational field of the black hole. Moreover the effective force acting on the particle visibly reduces with distance. Thus particle near the black hole will experience higher effective force as compared to when it is far away. 
Abdul Jawad, Farhad Ali, Mubasher Jamil and Ujjal Debnath
gr-qc