A container is filled to a depth of 22.0 cm with water. On top of the water floats a 35.0-cm-thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container

In one experiment the electric field is measured for points at distances r from a uniform line of charge that has charge per unit length λ and length l, where l≫r. in a second experiment the electric field is measured for points at distances r from the center of a uniformly charged insulating sphere that has volume charge density ρ and radius r