  A reply is made to Comment by D.P.Sheehan in which he takes notice that the
quantum force introduced in my earlier paper A.V.Nikulov, Phys. Rev. B 64,
012505 (2001) challenges to the absolute status of the second law of
thermodynamics. It is shown that the introduction of the quantum force explains
only an experimental challenge to the second law. The observation of the
persistent current at non-zero resistance R > 0 is experimental evidence of
violation of the postulate saving the second law in the beginning of the 20
century. According to this postulate any Brownian motion is absolutely random
whereas the persistent current at R > 0 is a regulated Brownian motion.
