Problem 9 (25 pts) A solid insulating sphere of radius 100m has a total charge of -67 pC and this charge is uniformly distributed throughout the volume - (A) Calculate the electric field at a distance of 2.4 cm from the center of the sphere (7pts) - (B) Calculate the electric field at a distance of 6.8 cm from the center of the sphere (7pts) Now assume the sphere is made of aluminum and the charge is distributed accordingly - (C) Calculate the electric field at a distance of 6.8 cm from the center of the sphere (6pts) - (D) Calculate the electric field at a distance of 13.5 cm from the center of the sphere (5pts)