Abstract
Mutual interaction between electromagnetic and gravitational fields canbe treated in the framework of the general theory of relativity. Thisposes a difficult problem but different approximations can be introducedin order to grasp interesting effects and to describe mechanisms whichgovern astronomical objects.The electromagnetic field near a rotating black hole is exploredhere. By employing an analytic solution for the weak electromagneticfield in vacuum, we plot the surfaces of constant flux and we show howthe field is dragged around the black hole by purely geometrical effectsof the strong gravitational field. We visualize the complicatedstructure of magnetic lines and we also mention possible astrophysicalapplications of more realistic situations involving the presence ofplasma. The entangled and twisted field lines result in reconnectionprocesses which accelerate the particles injected into the vicinity of theblack hole. Such acceleration mechanisms of electromagnetic origin areconsidered as a possible source of high-speed plasma jets emergingfrom numerous nuclei of galaxies where black holes reside.
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