Figure 6. The quasi-static electric field as a function of distance for various electro-kinetic source sizes l . q=10-4 , remaining parameters from Table 6. Dashed lines: C1-C2=10-7 V/Pa; solid lines, C1-C2=10-6 V/Pa. (1) l=10 m, (2) l=100 m, (3) l=1 km, (4) l=10 km.