試題詳解

40. What is the capacitance C of an isolated conductive spherical shell of radius R in free space with total charge Q uniformly distributed over its surface? (You can think of the second conductor as a hollow conducting shell of infinite radius.)
(A) 0
(B) 4 πρ² Q
(C) 2πε₀RQ
(D) 2 πε₀Ρ
(E) 4 πε₀Ρ