Two coaxial conducting cones have their vertices at the origin and the z axis as their axis. Cone A has the point A(1, 0, 2) on its surface, while cone B has the point B(0, 3, 2) on its surface. Let V_A = 100 V and V_B = 20 V. Find

(a) α for each cone;

(b) V at P(1, 1, 1).