1) A proton is at the origin and an electon is at the point x = 0.41 nm, y = 0.36 nm. Find the electric FIELD at the proton.
2) A thin spherical shell of radius 8.0 cm carries a charge of -20 nC distributed uniformly over its surface. Find the magnitude and direction of the electric field at the following distances from the center of the hollow sphere
a) r1 = 2.0 cm (inside the sphere)
b) r2 = 15.0 cm (outside the sphere)