The setup above shows two electrodes, Electrode 1 and 2, injecting currents of +l and -I, respectively; in an extracellular medium with a conductivity of o=1 Q/m1. The electrodes are centered, and the inter- electrode distance is L1=250 um. Distance between the two points A and B is L2=20 m. The mid-point between the points A and B is also the mid-point between the centers of the two electrodes. a. The electrodes act like a dipole. In that case, express the potential Vas between the two points A and B, created by the dipole. b. What should be the maximum current /, if the maximum value of VAB, namely VAB, max-0.4 V? L1=250 um L2=20 um Electrode 2 Electrode 1 +I VAB -I