Physics-
General
Easy
Question
A light bulb, a capacitor and a battery are connected together as shown here, with switch 
initially open. When the switch is closed, which one of the following is true
- The bulb will light up for an instant when the capacitor starts charging
- The bulb will light up when the capacitor is fully charged
- The bulb will not light up at all
- The bulb will light up and go off at regular intervals
The correct answer is: The bulb will light up for an instant when the capacitor starts charging
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.
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