試題詳解

56. Given a non-uniform charge distribution ρ(r)= alr (C/m³) between two concentric spheres of radius R and 2R, and it is enclosed by a thin metal spherical shell of radius 2R (negligible thickness) as shown in Fig. 10, what is the surface charge density on the inner surface of the metal shell?

(A)
(B)
(C)
(D)
(E)