Unlike most real bulbs, the resistance of the bulb in the questions below does n

Question

Unlike most real bulbs, the resistance of the bulb in the questions below does not change as the current through it changes. A capacitor, a bulb, and a switch are in the circuit as shown below. The switch is initially open as shown in the above diagram, and the capacitor is charged. Which of the following correctly describes what happens to the bulb when the switch is closed? The bulb is dim and remains dim. None of these is correct. At first the bulb is bright and it gets dimmer and dimmer until it goes off. The bulb is bright and remains bright. At first the bulb is dim and it gens brighter and brighter until the brightness levels off. Which correctly describes what happens after the switch has remained closed for a long time? The bulb is permanently off. The bulb is on and is bright. None of these is correct. The potential difference across the capacitor is steady. The current in the circuit is steady.

Explanation / Answer

a) At first bulb is bright and it gets dimmer and dimmer until it goes off.

The capacitor discharges through the bulb, and finally all energy is dissipated and the bulb is off. Voltage goes to zero.

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