(Next three questions) We have a spherical ball in a vacuum with three layers: the center and outer layers have constant charge density p = 0.7 C/m and the middle layer is a perfect conductor. We'll define zero potential, V = 0, at an infinite distance away from the sphere. The radii are a = 0.3 m, b = 0.7 m, and c = 1 m. a Figure 3: Figure for Problems 9-11 9. Potential at purple dashed line 1 point (a) What is the potential at r=0.4 m away from the center of the sphere (purple dashed line)? 10. (number 10) Potential at yellow dashed line 1 point What is the potential at r=0.85 m away from the center of the sphere (yellow dashed line)? 11. (number 11) Potential at green dashed line 1 point What is the potential at r=1.2 m away from the center of the sphere (green dashed line)?