We know that Aharonov-Bohm effect is explained by quantum theory. But, I imagine the situation that the solenoid is very far from two-slit. In this case, does Aharonov-Bohm effect happen? Current quantum theory doesn't consider the distance between two-slit and the solenoid. When the distance two-slit and the solenoid becomes larger, Aharonov-Bohm effect disappears or continues?