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The structure and magnitude of the electric field created by a rotatingaccretion disk with a poloidal magnetic field is found for the case of a vacuumapproximation along the axis. The accretion disk is modeled as a torus filledwith plasma and the frozen-in magnetic field. The dimensions and location ofthe maximum electric field are found, as well as the energy of the acceleratedparticles. The gravitational field is assumed to be weak.Comment: 10 pages, 4 figure

An induction accelerator of cosmic rays on the axis of an accretion disk