Figure 9
From: Classification of the extracellular fields produced by activated neural structures
The potentials generated by a "quadrupole" formed from three conducting spheres of radius 0.25 mm centered around z = +/-0.75 mm and z = 0 held at constant potential 1,1,-2 respectively placed in cylindrical volume conductors of differing sizes. The flat ends of the cylinder are at ground potential and the curved surface is taken as an insulator.