  Connection between an intrinsic breach of symmetry of equilibrium motion and
violation of the second law is accentuated. An intrinsic breach only of
clockwise - counter-clockwise symmetry of a circular equilibrium motion can be
logical under equilibrium conditions, whereas a breach of right-left symmetry
should be always an actual violation of the second law. The reader's attention
is drawn to experimental evidence of an intrinsic breach of the clockwise -
counter-clockwise symmetry of a circular equilibrium motion, well known as the
persistent current. The persistent current is observed in mesoscopic normal
metal, semiconductor and superconductor loops and the clockwise -
counter-clockwise symmetry is broken because of the discrete spectrum of the
permitted states of quantum charged particles in a closed loop. The quantum
oscillations of the dc voltage observed on a segment of an asymmetric
superconducting loop is experimental evidence of the intrinsic breach of the
right-left symmetry and an actual violation of the second law.
