The Aharonov-Bohm effect will be discussed. What is it, what does it mean, what work has been and should still be done, and can we use it for anything? These questions and the relation between the “Feynman paradox” and the Aharonov-Bohm effect will be addressed.
Magnetic field lines (blue) and vector field lines (green) for a solenoid that are relevant for the AB-effect are shown. For a description see Physics Today september 2009.