阿摩線上測驗
45. There are two parallel-plate capacitors with same plate area A. As the figure illustrated, C1 is filled with two materials of dielectric constants κ and 2κ, while C2 is filled with only one material. The capacitance ratio C1 / C2 is___________ . 
(A) 0.5
(B) 1.0
(C) 1.5
(D) 2.0
(E) 2.5
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統計： A(2), B(0), C(57), D(0), E(2) #2356606
統計： A(2), B(0), C(57), D(0), E(2) #2356606
