2. At first the bulb is dim and it gets brighter and brighter until the brightne

Question

2. At first the bulb is dim and it gets brighter and brighter until the brightness levels off. 3. None of these is correct. 4. The bulb is dim and remains dim. 5. The bulb is bright and remains bright. Unlike most real bulbs, the resistance of the bulb in this question 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? 1. At first the bulb is bright and it gets dimmer and dimmer until it goes off.

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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