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We investigate effect of a test magnetic field on the process of destroyingnear-extremal Kerr black hole with a charged test particle. It has been shownthat it would be possible to throw a charged test particle into the nearextremal rotating black hole and make it go past the extremality i.e. turn Kerrblack hole into the Kerr-Newmann naked singularity. Typically in anastrophysical scenario black holes are believed to be surrounded by a magneticfield. Magnetic field although small, affects motion of charged particlesdrastically due to the large Lorentz force, as the electromagnetic force ismuch stronger that the gravity. Thus a test magnetic field can affect theprocess of destroying black holes and restore the cosmic censorship in theastrophysical context. We show that a test magnetic field would act as a cosmiccensor beyond a certain threshold value. We try to gauge the magnitude of themagnetic field by comparing its energy density with that of the change in thecurvature induced by the test particle. We find that the magnetic fieldrequired in only as strong as or slightly stronger as compared to the value forwhich its effect of the background geometry is comparable to the tinybackreaction as that of the test particle. In such a case however one has totake take into account effect of the magnetic field on the background geometry,which is difficult to implement in the absence of any exact near-extremalrotating magnetized black hole solutions. We argue that magnetic field wouldstill act as a cosmic censor.

Destroying a near-extremal Kerr black hole with a charged particle: Can a test magnetic field serve as a cosmic censor?