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We consider collision of two particles in the axially symmetric black holemetric in the magnetic field. If the value of the angular momentum |L| of oneparticles grows unbound (but its Killing energy remains fixed) one can achieveunbound energy in the center of mass frame E_{c.m.} In the absence of themagnetic field, collision of this kind is known to happen in the ergoregion.However, if the magnetic field strength B is also large, with the ratio |L|/Bbeing finite, large E_{c.m.} can be achieved even far from a black hole, in thealmost flat region. Such an effect also occurs in the metric of a rotatingstar.

High energy collision of particles in the magnetic field far from black holes