Consider a circuit consisting of a lightbulb and a capacitor, as shown in circuit 2 of Conceptual Example 24-10.
(a) If the frequency of the generator is increased, does the intensity of the lightbulb increase, decrease, or stay the same?
(b) Choose the best explanation from among the following:
I. As the frequency increases it becomes harder to force current through the capacitor, and therefore the intensity of the lightbulb decreases.
II. The intensity of the lightbulb increases because as the frequency becomes higher the capacitor acts more like a short circuit, allowing more current to flow.
III. The intensity of the lightbulb is independent of frequency because the circuit contains a capacitor but not an inductor.