  Recent literature on the Aharonov-Bohm effect has raised fundamental
questions on the classical correspondence of this effect and the physical
reality of the electromagnetic potentials in quantum mechanics. Reappraisal on
Feynman's approach to the classical limit of AB effect is presented. The
critique throws light on the significance of quantum interference and quantum
phase shifts in any such classical correspondence. Detailed analysis shows that
Feynman arguments are untenable on physical grounds and the claim made in the
original AB paper that this effect had no classical analog seems valid. The
importance of nonintegrable phase factor distinct from the AB phase factor,
here termed as Fock-London-Weyl phase factor for the historical reasons, is
underlined in connection with the classical aspects/limits. A topological
approach incorporating the physical significance of the interaction field
momentum is proposed. A new idea emerges from this approach that attributes the
origin of the AB effect to the exchange of modular angular momentum.
