  A novel kind of nonlocal, macroscopic Aharonov-Bohm effect involving two
topologically linked superconducting rings made out of two different materials,
namely, lead and tin, is suggested for experimental observation, in which the
lead ring is a torus containing a core composed of permanently magnetized
ferromagnetic material. It is predicted that the remnant fields in a hysteresis
loop induced by the application of a magnetic field imposed by a large external
pair of Helmholtz coils upon the tin ring, will be asymmetric with respect to
the origin of the loop. An appendix based on Feynman's path-integral principle
is the basis for these predictions.
