POLARIZABLE QUANTUM-SYSTEMS IN CROSSED ELECTRIC AND MAGNETIC-FIELDS

It is found that a neutral particle acquires a nontrivial quantum phas e independent of the paticlevelocity in crossed electric and magnetic fields. It is proved that the phase is independent of the particle tra jectory shape if the fields are homogeneous along a certain direction. The phase induced by the crossed fields is shown to be responsible fo r dissipation-free flows in superfluid systems, which are similar to t he Meissner currents in superconductors.