The phase shift acquired by the Aharanov-Bohm effect for two identical charged particles traveling different paths is given by two pi times this quantity times the charge over Planck's constant.  
The phase shift acquired by the Aharanov-Bohm effect for two identical charged particles traveling different paths is given by two pi times this quantity times the charge over Planck's constant.  Molecular clouds undergo dynamic collapse on a modified Jeans length when the ratio of mass to this quantity reaches a critical value.  The quantum of this quantity is given by Planck's constant over twice the electron charge, and is the inverse of the Josephson constant.  The negative time derivative of this quantity equals the emf induced in a circuit according to Faraday's law.  FTP, name this quantity which equals the integral of the magnetic field over any surface bounded by a particular closed loop.
The phase shift acquired by the Aharanov-Bohm effect for two identical charged particles traveling different paths is given by two pi times this quantity times the charge over Planck's constant.  
magnetic {flux}