QUANTUM PHASE OF INDUCED DIPOLES MOVING IN A MAGNETIC-FIELD

We derive the quantum phase accompanying a neutral particle (with no p ermanent electric dipole moment) moving in an area where a nonuniform electric field and a uniform magnetic field are simultaneously applied . Such a quantum phase can be ascribed to the sum of the Aharonov-Bohm phases of the charges constituting the neutral particle. An experimen tal configuration much more practical than a previous suggestion is pr oposed to test for the phase. The possible nonzero superfluid velocity in the ground state of the He-4 condensate is theoretically demonstra ted.