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.