Figure 20.65 shows three circuits labeled A, B, and C. All the thin-filament bulbs, capacitors, and batteries are identical and
are like the equipment you used in class. The capacitors are initially uncharged. In each circuit the batteries are connected
for a short time T and then disconnected. The time T is only 10% of the total charging time through a single thin-filament
bulb, so that the bulb brightness doesn't change much during the time T.
(a) In which circuit (A, B, or C) does the capacitor now have the most charge? Explain.
(b) In which circuit (A, B, or C) does the capacitor now have the least charge? Explain.
(c) Design and carry out experiments to check your answers. Describe your experiments and the numerical results.
Before each experiment, connect a wire across the capacitor for a few seconds to fully discharge the capacitor. One
way to compare the amount of charge stored in the capacitor during the time T is to finish charging it through a
single thin-filament bulb, and see how much less time is required than when you start with a discharged capacitor.