問題詳情

57. A charging RC circuit consists of a battery with emf ε, a resistor R, and twocapacitors C1 and C2 as shown in Fig. 11. The two capacitors are identical whenthere are no dielectrics inserted (that is C1 = C2=when placed in vacuum). In order to increase thecapacitance, we place a dielectric material ofthe dielectric constant x in C2. At t = 0, thereare no charges in capacitors, and we close theswitch to charge these capacitors. Which of thefollowing statements is correct?
  


(A) The charging percentage (

) of these two capacitors would be the sameat all times.
(B) The maximum charges stored in these two capacitors would be the same.
(C) The charging time would reduce if a larger resistor is used.
(D) The charging time would reduce if a battery with a larger enf is used.
(E) As more and more charges are stored in the capacitors, we expect the currentflowing through the resistor is getting larger and larger.

參考答案

答案：A
難度：計算中-1
書單：沒有書單，新增