Magnetic Field of Aromatics  This current created by the revolving exchange of pi electrons around the aromatic ring causes the ring to also have a magnetic field. This is a result of Faraday's law where an induced current will also induce a magnetic field. The current going around the aromatic ring causes an induced magnetic field which goes up around the outside of the ring and then down through the middle of the aromatic ring. http://upload.wikimedia.org/wikipedia/commons/7/72/Benzene_ring_currents.png This image shows the vector fields of the ring current and induced magnetic field. http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/nmr/Images/benzene.gif