Question
Question: A light bulb, a capacitor and a battery are connected together as shown here, with switch \(S\) init...
A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open. When the switch Sis closed, which one of the following is true
A
The bulb will light up for an instant when the capacitor starts charging
B
The bulb will light up when the capacitor is fully charged
C
The bulb will not light up at all
D
The bulb will light up and go off at regular intervals
Answer
The bulb will light up for an instant when the capacitor starts charging
Explanation
Solution
Initially when key is closed, the capacitor acts as short-circuit, so bulb will light up. But finally the capacitor becomes fully charged, so it will act as open circuit, so bulb will not glow.