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. +8 O c. O Od. -2 O e. -8 f. More than one of the listed numerical answers are possible. O g. +2 Oh. +4