9. A hollow metal sphere of radius R is positively charged. Of the following distances from the center of the sphere, which location will have the greatest electric field strength?
(A) 0 (center of the sphere)
(B) 3R/2
(C) 2 R
(D) None of the above because the field is of constant strength
(A) 0 (center of the sphere)
(B) 3R/2
(C) 2 R
(D) None of the above because the field is of constant strength