試題詳解

46. A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points? (k_e = 9 x 109 N•m² /C2 )
(A) 15 V
(B) 23 V
(C) 30 V
(D) 45 V
(E) 60 V