A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open. When the switch S is closed, which one of the following is true ?
A
The bulb will light up for an instant when the capacitor starts charging.
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B
The bulb will light up when the capacitor is fully charged.
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C
The bulb will not light up at all.
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D
The bulb will light up and go off at regular intervals.
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Solution
The correct option is A 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.