Abstract
We discuss dynamical properties of generally non-Keplerian equatorial circular orbits and zero-angular-momentum spherical polar orbits around Kerr - Newman black holes. By considering charged test particles, the thrust is simply represented by the Lorentz force due to the electromagnetic field of the hole. We analyse the properties of the rotospheres in which the acceleration of the particles depends on their orbital angular velocity in a counter-intuitive manner, and we interpret the results in terms of suitably defined forces of classical type.
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