Question 3 A spherical conducting shell has an inner radius of 0.2 m and an outer radius of 0.4 m. There is no charge on the outer surface but the shell does have a nonzero net Incorrect charge. All charges remain at rest. The potential at the outer surface is -2 V. The potential at the center of the cavity is _ _ V. 0.00 points out of 1.00 Flag question O a. -4 Ob. -2x O c. +4 O d. +8 O e. - +2 O g. 0 O h. More than one of the listed numerical answers are possible