Charge q is distributed uniformly throughout the volume of an insulating sphere of radius r = 4.00 cm. at a distance of r = 8.00 cm from the center of the sphere, the electric field due to the charge distribution has magnitude 990 n/ca) what is the volume charge density for the sphere? b) what is the magnitude of the electric field at a distance of 2.00 cm from the sphere's center?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve