  The dynamics of a charged particle moving around a slowly rotating Kerr black
hole in the presence of an external magnetic field is investigated. We are
interested to explore the conditions under which the charged particle can
escape from the gravitational field of the black hole after colliding with
another particle. The escape velocity of the charged particle in the innermost
stable circular orbit is calculated. The effective potential and escape
velocity of the charged particle with angular momentum in the presence of
magnetic field is analyzed. This work serves as an extension of a preceding
paper dealing with the Schwarzschild black hole [Zahrani {\it et al}, Phys.
Rev. D 87, 084043 (2013)].
