試題詳解

57. A charging RC circuit consists of a battery with emf ε, a resistor R, and two capacitors C₁ and C₂ as shown in Fig. 11. The two capacitors are identical when there are no dielectrics inserted (that is C₁ = C₂= when placed in vacuum). In order to increase the capacitance, we place a dielectric material of the dielectric constant x in C₂. At t = 0, there are no charges in capacitors, and we close the switch to charge these capacitors. Which of the following statements is correct?
  
(A) The charging percentage () of these two capacitors would be the same at 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 current flowing through the resistor is getting larger and larger.