  We have shown that changes occur in a (2+1)-dimensional charged black hole by
adding a charged probe. The particle increases the entropy of the black hole
and guarantees the second law of thermodynamics. The first law of
thermodynamics is derived from the change in the black hole mass. Using the
particle absorption, we test the extremal black hole and find out that the mass
of the extremal black hole increases more than the electric charge. Therefore,
the outer horizon of the black hole still exists. However, the extremal
condition becomes non-extremal.
