1. A disk of radius R has positive charge Q distributed uniformly across its surface. The disk lies flat in the xy-plane, and the z-axis intersects the disk at its center. Z x (3) Determine the electric potential at all points on the z-axis. Assume that the potential goes to zero infinitely far away from the disk. (b) From the potential you found in Part (a), determine the electric field at all points on the zaxis. Make sure that your electric field points in the correct direction above and below the disk. 2. In the network shown below, C1 = 3 uF and Vab = 150 V. The charge on C, is 150 uC and the charge on C3 is 450 JC. C1 a C2 b C3 What are the values of the capacitances of C2 and C3