  By throwing a test charged particle into a Reissner-Nordstrom (RN) black
hole, we test the validity of the first and second laws of thermodynamics and
weak cosmic censorship conjecture (WCCC) with two types of boundary conditions,
i.e., the asymptotically anti-de Sitter (AdS) space and a Dirichlet cavity wall
placed in the asymptotically at space. For the RN-AdS black hole, the second
law of thermodynamics is satisfied, and the WCCC is violated for both extremal
and nearextremal black holes. For the RN black hole in a cavity, the entropy
can either increase or decrease depending on the change in the charge, and WCCC
is satisfied/violated for the extremal/nearextremal black hole. Our results
indicate that there may be a connection between the black hole thermodynamics
and the boundary condition imposed on the black hole.
