  The energy of magnetic moment of the persistent current circulating in
superconducting loop in an externally produced magnetic field is not taken into
account in the theory of quantization effects because of identification of the
Hamiltonian with the energy. This identification misleads if, in accordance
with the conservation law, the energy of a state is the energy expended for its
creation. The energy of magnetic moment is deduced from a creation history of
the current state in magnetic field both in the classical and quantum case. But
taking this energy into account demolishes the agreement between theory and
experiment. Impartial consideration of this problem discovers the contradiction
both in theory and experiment.
