Ring Current Since the pi electrons in these p-orbitals are delocalized, they can be thought of as being shared by every carbon of the aromatic ring Since the electrons can move from on carbon p-orbital to the overlapping carbon p-orbital without changing the compound the electrons are free to move in a circle in the overlapping p-orbitals around the aromatic ring. This circular movement around the aromatic ring by the electrons causes a current to be formed by the moving electrons because the negative charged electrons are moving from one carbon to the next.   http://www.analyticalspectroscopy.net/ap7_html_7d5bd661.gif The inside circle of the benzene ring shows the direction of current caused by the pi electrons going around the ring. The current resulting from a benzene ring is I=(-ne^2H0)/4pi m c where n is the number of electrons, e is the charge on the electron, H0 is the strength of a perpendicular magnetic field